100 Most Important Topics for UPSC Prelims 2026: Complete Subject-Wise List, Weightage & 60-Day Revision Plan

UPSC Prelims 2026 will be decided not by who studied the most, but by who revised the right things the most number of times. If you have covered the syllabus twice already, adding more new material now is counterproductive. What you need is a sharp, evidence-based list of the highest-yield topics — and a plan to revise them with precision.

This article gives you exactly that. The 100 most important topics for UPSC Prelims 2026 have been selected based on four filters:

• PYQ frequency — topics that have appeared in UPSC Prelims papers 3 or more times in the last decade
• Syllabus weightage — topics explicitly mentioned in the UPSC-prescribed syllabus
• Current affairs integration — static topics that are being actively linked to 2025–2026 news events
• Mentor consensus — topics consistently flagged by serious UPSC coaches and toppers as non-negotiable

Use this list as your final revision boundary. Do not go outside it in the last 60 days. Revise everything on it at least three times. That is the formula.

Understanding Subject-Wise Weightage in UPSC Prelims 2026

Before starting revision, you need to know where the marks are. UPSC Prelims Paper I has 100 questions worth 200 marks, with a negative marking of 0.66 marks per wrong answer. Based on PYQ analysis from 2015 to 2025, the approximate distribution is:

Subject	Approximate Questions	Why It Matters
Current Affairs	15–20	Highest variance — can make or break your score
Polity & Governance	12–15	Most consistent, highest PYQ predictability
Environment & Ecology	10–15	Fastest-growing section, often current-affairs linked
Economy	10–12	Increasingly data and scheme oriented
History & Culture	10–12	Modern history dominates; art and culture is high-yield
Geography	8–12	Physical geography + mapping in news
Science & Technology	8–10	Space, biotech, AI — almost always current affairs linked

The single most important strategic insight: UPSC does not ask Current Affairs as a separate section. It embeds current events inside static subjects. A question about the Strait of Hormuz is simultaneously Geography, Economy, and Current Affairs. A question about the IUCN Red List is simultaneously Environment and Current Affairs. Preparing subjects in isolation is the most common reason intelligent aspirants miss the cut-off.

Section 1: Polity & Governance — 20 Most Important Topics

Polity consistently delivers 12–15 questions in every Prelims paper. It is also the most predictable section — UPSC tends to revisit the same constitutional provisions, landmark judgments, and institutional frameworks repeatedly. A thorough revision of these 20 topics can conservatively guarantee 10+ correct answers.

1. Preamble — Keywords, Philosophy and Amendability The Preamble is the most frequently tested single document in UPSC Prelims history. Know every word: Sovereign, Socialist, Secular, Democratic, Republic, Justice (social, economic, political), Liberty, Equality, Fraternity. Understand the Berubari Union case (Preamble is not part of Constitution) and Kesavananda Bharati (Preamble can be amended but basic structure cannot be altered). The 42nd Amendment added Socialist and Secular in 1976 — this is a direct PYQ.

2. Fundamental Rights — Articles 12 to 35 Know every right, its Article number, and its exceptions. Article 19 (six freedoms and their reasonable restrictions under Articles 19(2) to 19(6)) is asked almost every year. Article 21 (Right to Life) has the widest judicial interpretation — right to livelihood, right to education, right to privacy (Puttaswamy judgment 2017), right to a clean environment. Article 32 (Right to Constitutional Remedies) is what Dr. Ambedkar called the heart and soul of the Constitution. Know the five writs — Habeas Corpus, Mandamus, Prohibition, Certiorari, Quo Warranto — and when each applies.

3. Directive Principles of State Policy — Articles 36 to 51 Classify DPSPs into three groups: Socialistic (Articles 38, 39, 41, 42, 43, 43A, 47), Gandhian (Articles 40, 43, 43B, 46, 48, 48A), and Liberal-Intellectual (Articles 44, 45, 49, 50, 51). The conflict between Fundamental Rights and DPSPs — and how the courts have resolved it through the Basic Structure Doctrine — is a recurring Mains and Prelims theme. Article 44 (Uniform Civil Code) has been in the news consistently through 2024–2026.

4. Fundamental Duties — Article 51A Added by the 42nd Amendment (1976) based on the Swaran Singh Committee recommendations. Originally 10 duties, expanded to 11 by the 86th Amendment (2002) which added the duty to provide opportunities for education to children aged 6–14. Duties are not enforceable in court but courts use them for interpretation. Know all 11 duties word for word — UPSC asks matching-type questions.

5. Basic Structure Doctrine Established in Kesavananda Bharati v. State of Kerala (1973) — a 13-judge bench decided by a 7:6 majority. Parliament can amend any part of the Constitution under Article 368 but cannot destroy its basic structure. Elements of basic structure identified in various judgments include: supremacy of the Constitution, republican and democratic form of government, secular character, separation of powers, federal character, free and fair elections, judicial review, rule of law, parliamentary system, and unity and integrity of India.

6. Constitutional Amendments — 1st to 106th Do not try to memorise all 106. Focus on the most-tested ones: 1st (land reforms, reasonable restrictions on FR), 7th (reorganisation of states), 24th (Parliament can amend FRs), 42nd (socialist, secular, fundamental duties), 44th (right to property no longer FR), 52nd (anti-defection), 61st (voting age 21 to 18), 73rd and 74th (Panchayati Raj and urban bodies), 86th (free and compulsory education), 97th (cooperative societies), 101st (GST), 102nd (National Commission for Backward Classes), 103rd (10% EWS reservation), 104th (extension of SC/ST reservation), 105th (OBC sub-classification), 106th (33% women reservation in Parliament and State Assemblies).

7. Union Executive — President, Prime Minister, Council of Ministers President’s election (Electoral College, single transferable vote), powers (executive, legislative, judicial, financial, emergency, diplomatic, military), and the concept of pocket veto and absolute veto. Difference between President and Governor in discretionary powers. PM’s relationship with President — Article 74 (Council of Ministers to aid and advise) and Article 75 (PM appointed by President, other ministers on PM’s advice). Collective responsibility under Article 75(3).

8. Governor and State Executive Governor’s appointment (Article 155), tenure (Article 156 — pleasure of President), discretionary powers, and the controversy around Article 356 misuse. The Sarkaria Commission and Punchhi Commission recommendations on Governor’s role are frequently tested. Know recent Supreme Court judgments on the Governor’s power to withhold assent to state bills — this became a significant news story in 2023–2024 involving Tamil Nadu, Kerala, and Punjab.

9. Parliament — Structure, Sessions, and Key Procedures Rajya Sabha — 238 elected + 12 nominated, permanent body. Lok Sabha — maximum 543 elected + 2 Anglo-Indian (abolished by 104th Amendment). Joint sitting under Article 108 (called by President, presided over by Lok Sabha Speaker). Sessions — Budget Session (Feb–May), Monsoon Session (July–Aug), Winter Session (Nov–Dec). Prorogation vs Adjournment vs Dissolution. Know the quorum requirement (1/10th of total membership).

10. Parliamentary Procedures — Money Bill, Finance Bill, Question Hour Money Bill under Article 110 — can only be introduced in Lok Sabha, Rajya Sabha can only make recommendations (not reject), President cannot withhold assent. Finance Bill — contains both Money Bill provisions and other financial provisions. Difference tested directly in Prelims 2016 and 2019. Question Hour (first hour of every sitting), Zero Hour (immediately after Question Hour), starred vs unstarred questions, calling attention motion, adjournment motion, no-confidence motion.

11. Supreme Court — Powers and Jurisdiction Original jurisdiction (Article 131) — disputes between Government of India and one or more states, or between states. Appellate jurisdiction (Articles 132–134) — constitutional, civil, and criminal cases. Advisory jurisdiction (Article 143) — President can seek opinion. Writ jurisdiction (Article 32) — cannot be suspended except during national emergency. Difference between Article 32 (Supreme Court) and Article 226 (High Court) — High Court has wider writ jurisdiction.

12. Judicial Review and Judicial Activism Judicial review is the power of courts to examine the constitutional validity of legislative and executive acts. Judicial activism refers to courts going beyond traditional interpretation to protect rights and enforce governance. PIL (Public Interest Litigation) — introduced by Justice P.N. Bhagwati — is the primary instrument of judicial activism in India. Recent SC judgments on electoral bonds, Article 370, and demonetisation are high-yield current affairs connections.

13. Federalism and Centre-State Relations — Articles 245–263 Legislative relations (Articles 245–255) — Union List (97 subjects), State List (66 subjects), Concurrent List (47 subjects). Administrative relations (Articles 256–263) — Centre’s power to give directions, All India Services, Inter-State Council. Financial relations — grants-in-aid, Finance Commission recommendations. Recent tensions between States and the Centre over Governor’s role, GST compensation, and NEET have kept federalism in current affairs throughout 2024–2026.

14. Emergency Provisions National Emergency (Article 352) — grounds: war, external aggression, armed rebellion (not internal disturbance since 44th Amendment). President’s Rule (Article 356) — failure of constitutional machinery in state. Financial Emergency (Article 360) — never invoked. Differences in proclamation, parliamentary approval, duration, effects on Fundamental Rights, and revocation between all three — these comparative questions appear regularly.

15. Election Commission of India Article 324 — superintendence, direction, and control of elections to Parliament, State Legislatures, President, and Vice President. Chief Election Commissioner cannot be removed except through the same process as a Supreme Court judge. Recent Chief Election Commissioner and Other Election Commissioners Act 2023 changed the appointment process — removing the CJI from the selection committee — which became a major controversy and is high-probability Prelims 2026 material.

16. Finance Commission Article 280 — constituted every five years by the President. Functions: recommend distribution of net proceeds of taxes between Centre and States (vertical devolution) and among States (horizontal devolution). Also recommends grants-in-aid (Article 275). 15th Finance Commission (2021–2026) recommended 41% devolution to states. 16th Finance Commission constituted in 2023 under Dr. Arvind Panagariya — its interim recommendations are current affairs.

17. CAG and Other Constitutional Bodies Comptroller and Auditor General (Article 148) — audits all accounts of Union and States. Reports placed before Parliament/State Legislature. CAG cannot be removed except through address of both Houses of Parliament. Distinguish CAG (constitutional) from CVC (statutory) and CBI (statutory). Know all constitutional bodies: Election Commission, Finance Commission, UPSC, SPSC, CAG, National Commissions for SC/ST/OBC/Women/Minorities — and which are constitutional vs statutory.

18. Anti-Defection Law — 10th Schedule Added by 52nd Amendment (1985). Disqualification grounds: voluntarily giving up party membership, voting against party direction. Exceptions: merger (when 2/3rd of party members agree). Decision by Speaker/Chairman — this power has been challenged in courts as creating conflict of interest. Supreme Court in Nabam Rebia case (2016) and recent Shiv Sena judgment (2023) — Maharashtra political crisis — are must-know current affairs.

19. Local Bodies — 73rd and 74th Amendments 73rd Amendment (1992) — Panchayati Raj institutions, 11th Schedule (29 subjects), mandatory reservation for SC/ST and women (1/3rd minimum). 74th Amendment (1992) — Urban Local Bodies, 12th Schedule (18 subjects). State Election Commission and State Finance Commission — constitutional requirements under both amendments. District Planning Committees (Article 243ZD) and Metropolitan Planning Committees (Article 243ZE).

20. Constitutional vs Statutory vs Regulatory Bodies A direct question type that appears almost every year. Constitutional bodies are created by the Constitution itself (Election Commission, CAG, Finance Commission, UPSC). Statutory bodies are created by Acts of Parliament (SEBI, TRAI, CBI, CVC, NHRC). Regulatory bodies are created under specific sectoral laws. Know whether each body in the news — NCPCR, CIC, Lokpal, NGT, RERA — is constitutional, statutory, or regulatory, and under which act it was established.

Section 2: Economy — 20 Most Important Topics

Economy questions have become increasingly practical, data-linked, and scheme-oriented. Pure theory is rarely tested — UPSC prefers application. Know the concept, know the current data, know the relevant scheme.

1. Inflation — CPI, WPI, Core Inflation Consumer Price Index (CPI) is India’s headline inflation measure — used by RBI for monetary policy targeting. Base year: 2012. Components: Food and Beverages (45.86%), Housing (10.07%), Fuel and Light (6.84%), Miscellaneous (28.32%). Wholesale Price Index (WPI) — measures producer-level prices. Core inflation = headline inflation minus food and fuel. RBI’s inflation target under the Flexible Inflation Targeting framework: 4% with a band of ±2%. Know the current inflation figures — these are direct Prelims question material.

2. Monetary Policy and RBI Tools Repo rate — rate at which RBI lends to commercial banks. Reverse repo rate — rate at which RBI borrows from banks. Cash Reserve Ratio (CRR) — percentage of deposits banks must hold with RBI (earns no interest). Statutory Liquidity Ratio (SLR) — percentage held in liquid assets (government securities). Open Market Operations (OMO) — RBI buying/selling government securities to manage liquidity. Marginal Standing Facility (MSF) — emergency borrowing by banks at repo rate + 0.25%. Monetary Policy Committee — 6 members (3 RBI + 3 external), decides repo rate.

3. Fiscal Policy and Deficits Revenue Deficit = Revenue Expenditure minus Revenue Receipts. Fiscal Deficit = Total Expenditure minus Total Receipts excluding borrowings — measures government borrowing requirement. Primary Deficit = Fiscal Deficit minus Interest Payments — measures current fiscal stress. Effective Revenue Deficit = Revenue Deficit minus grants for capital assets creation. FRBM Act 2003 — targets for fiscal deficit reduction. Medium Term Fiscal Policy — 3-year rolling targets. Know current year fiscal deficit as percentage of GDP.

4. Union Budget Basics Consolidated Fund of India (Article 266) — all revenues, loans, repayments. Contingency Fund (Article 267) — imprest of Rs 500 crore for unforeseen expenditure, requires parliamentary approval post facto. Public Account — money held by government in trust (PF, small savings). Demand for Grants — voted by Lok Sabha. Appropriation Bill — authorises withdrawal from CFI. Finance Bill — gives effect to financial proposals. Know the difference between capital and revenue expenditure and receipts.

5. Banking System and NPAs Non-Performing Assets — loans where interest or principal is overdue for more than 90 days. Gross NPA vs Net NPA (after provisioning). Resolution mechanisms: IBC 2016 (Insolvency and Bankruptcy Code) — most significant banking reform of the decade. SARFAESI Act 2002 — allows banks to recover loans without court intervention. Asset Reconstruction Companies (ARCs) — buy bad loans from banks at a discount. NARCL (National Asset Reconstruction Company Ltd) — bad bank set up by government. Know current Gross NPA ratio of Indian banking system.

6. Money Supply M0 (Reserve Money/High Powered Money) = Currency in Circulation + Bankers’ Deposits with RBI + Other Deposits with RBI. M1 = Currency with Public + Demand Deposits. M2 = M1 + Savings Deposits with Post Offices. M3 (Broad Money) = M1 + Time Deposits with Banks. M4 = M3 + All Post Office Deposits. Money Multiplier = M3/M0. RBI uses M3 as the primary monetary aggregate for policy purposes.

7. Financial Inclusion Pradhan Mantri Jan Dhan Yojana (PMJDY) — zero-balance accounts, RuPay debit card, overdraft facility, accidental insurance. PMJDY data — over 53 crore accounts, over Rs 2.3 lakh crore balance (know current figures). PM Mudra Yojana — loans up to Rs 10 lakh for micro enterprises (Shishu, Kishor, Tarun tiers). Stand-Up India — loans to SC/ST and women entrepreneurs. Business Correspondents model — extending banking to unbanked areas without brick-and-mortar branches.

8. Digital Payments — UPI and CBDC Unified Payments Interface (UPI) — launched by NPCI in 2016, real-time interbank payments. UPI processed over 130 billion transactions in FY2024–25. Central Bank Digital Currency (CBDC/e-Rupee) — digital form of sovereign currency issued by RBI. Retail e-Rupee (for public) vs Wholesale e-Rupee (for financial institutions). Difference between CBDC and cryptocurrency — CBDC is legal tender backed by RBI, crypto is not. India’s UPI is being adopted internationally — Singapore, UAE, France, Mauritius, Nepal, Sri Lanka — high probability Prelims question.

9. External Sector — BoP, Forex, CAD Balance of Payments — systematic record of all economic transactions between residents and the rest of the world. Current Account (trade in goods, services, income, transfers) + Capital Account (FDI, FPI, ECB, NRI deposits). Current Account Deficit (CAD) = Value of Imports minus Value of Exports of goods and services. Every $10 rise in crude oil prices widens India’s CAD by approximately 0.4–0.5% of GDP — direct connection to West Asia crisis 2026. India’s forex reserves — know current level (approximately $640–650 billion range — verify current figure).

10. Exchange Rate and Depreciation Fixed vs Flexible exchange rate regimes. India follows a managed float system — RBI intervenes to prevent excessive volatility without targeting a specific rate. Depreciation (market-driven fall in currency value) vs Devaluation (government-directed reduction). Impact of rupee depreciation: imports become costlier (inflationary), exports become cheaper (competitive), remittances become more valuable in rupee terms. Purchasing Power Parity (PPP) — used for comparing economic output across countries.

11. Economic Survey Themes The Economic Survey is presented by the Chief Economic Adviser (CEA) the day before the Union Budget. It provides a comprehensive review of the economy and sets the policy narrative. UPSC frequently asks questions based on Economic Survey data and themes. For 2025–26, key themes include climate finance, digital public infrastructure, India’s demographic dividend, and energy transition. Always read the Economic Survey summary and key highlights — they are direct question sources.

12. Government Schemes — Economy PM Gati Shakti National Master Plan — integrated infrastructure planning across 16 ministries. National Logistics Policy — reducing logistics cost from 13–14% of GDP to below 8%. PLI (Production Linked Incentive) Schemes — across 14 sectors including mobile phones, pharmaceuticals, solar PV, white goods. PM Vishwakarma Scheme — support for traditional artisans and craftspeople. National Monetisation Pipeline (NMP) — monetising brownfield public infrastructure assets. Semicon India Programme — semiconductor manufacturing ecosystem.

13. Subsidies and MSP Minimum Support Price (MSP) — announced by Cabinet Committee on Economic Affairs based on CACP recommendations. Currently covers 23 crops. Formula: C2+50% profit (Swaminathan Commission recommendation — legal guarantee still debated). DBT (Direct Benefit Transfer) — transferring subsidies directly to beneficiaries’ bank accounts. PM-KISAN — Rs 6,000 per year direct income support to farmer families. Food subsidy under NFSA — allocation through FCI at central issue price.

14. Agriculture Economics Agricultural Marketing — APMC (Agricultural Produce Market Committee) Acts, e-NAM (National Agriculture Market), and the controversy over the repealed Farm Laws 2020. Farmer Producer Organisations (FPOs) — government target of 10,000 FPOs. Pradhan Mantri Fasal Bima Yojana (PMFBY) — crop insurance scheme. PM-KISAN, PMFBY, PM Krishi Sinchai Yojana — know objectives, coverage, and recent data. Agricultural credit — KCC (Kisan Credit Card), priority sector lending norms.

15. Infrastructure Sector National Infrastructure Pipeline (NIP) — Rs 111 lakh crore investment target for FY2020–25. PM Gati Shakti — multimodal connectivity. Sagarmala — port-led development. Bharatmala — road development. UDAN scheme — regional air connectivity. Dedicated Freight Corridors — Eastern (Ludhiana to Dankuni) and Western (Dadri to JNPT). GIFT City — India’s first operational smart city and IFSC (International Financial Services Centre).

16. Employment and Unemployment Periodic Labour Force Survey (PLFS) — conducted by NSSO/MoSPI, measures employment and unemployment. Labour Force Participation Rate (LFPR), Worker Population Ratio (WPR), Unemployment Rate. Gig Economy — platform-based work, Social Security Code 2020 provisions for gig workers. MGNREGA — rural employment guarantee, 100 days per household, demand-driven, wage linked to CPI-AL. PMKVY — skill development for youth. Demographic dividend — India’s working-age population advantage and the need for job creation.

17. MSME Sector MSME definition revised in 2020 — based on investment and turnover (not employment): Micro (investment up to Rs 1 crore, turnover up to Rs 5 crore), Small (investment up to Rs 10 crore, turnover up to Rs 50 crore), Medium (investment up to Rs 50 crore, turnover up to Rs 250 crore). MSMEs contribute approximately 30% of GDP, 45% of exports, and employ over 11 crore people. Emergency Credit Line Guarantee Scheme (ECLGS) — post-COVID MSME support. Udyam Registration Portal.

18. Green Economy and Climate Finance Sovereign Green Bonds — India issued its first in January 2023 to finance green infrastructure. Carbon markets under Article 6 of Paris Agreement — trading of carbon credits between countries. ESG (Environmental, Social, Governance) investing. Green Hydrogen Mission — target of 5 million metric tonnes of green hydrogen production by 2030. LFTI (Long-Term Low Emissions Development Strategy) submitted to UNFCCC. Climate finance gap — developed countries’ $100 billion annual commitment to developing nations.

19. Taxation — Direct and Indirect GST structure — CGST, SGST, IGST, UTGST. GST Council — federal body, Finance Minister chairs, decisions by 3/4th majority. Five GST rate slabs: 0%, 5%, 12%, 18%, 28% (plus cess on sin goods). Input Tax Credit mechanism. Direct taxes — Income Tax, Corporate Tax, STT. Tax-to-GDP ratio — India at approximately 11%, well below OECD average of 34%. TDS (Tax Deducted at Source), TCS (Tax Collected at Source). Faceless Assessment and Appeal Scheme — digital tax administration reforms.

20. Disinvestment and Privatisation Disinvestment — government selling its stake in PSUs. Strategic disinvestment — sale of management control. National Monetisation Pipeline — leasing brownfield assets without ownership transfer. DIPAM (Department of Investment and Public Asset Management) — nodal body. Air India disinvestment (completed 2022) — strategic disinvestment to Tata Group. LIC IPO (2022) — government’s partial stake sale. Disinvestment targets in Union Budget vs actual achievement — a recurring economy current affairs theme.

Section 3: Environment & Ecology — 20 Most Important Topics

Environment has become the second-highest scoring section after Polity. Questions are increasingly conceptual and current-affairs linked. Know your conventions, protected areas, and species in news.

1. Ecosystem Concepts Ecosystem = biotic (living) + abiotic (non-living) components. Types: terrestrial (forest, grassland, desert) and aquatic (freshwater, marine, estuarine). Ecosystem services — provisioning (food, water, timber), regulating (climate regulation, flood control), cultural (recreation, spiritual), supporting (nutrient cycling, soil formation). Ecological succession — primary (on bare rock) and secondary (on previously vegetated land). Climax community — stable end state of succession.

2. Food Chain and Food Web Food chain — linear sequence of energy transfer. Food web — complex network of interconnected food chains. Grazing food chain (starts from green plants) vs Detritus food chain (starts from dead organic matter). 10% Law (Lindeman’s Law) — only 10% of energy transfers from one trophic level to the next. Trophic levels — producers (T1), herbivores (T2), primary carnivores (T3), secondary carnivores (T4), apex predators (T5).

3. Ecological Pyramids Pyramid of Numbers, Pyramid of Biomass, Pyramid of Energy. Pyramid of Energy is always upright (10% law). Pyramid of Numbers can be inverted (parasitic food chain — one tree supports thousands of insects). Pyramid of Biomass can be inverted (aquatic ecosystems — small phytoplankton biomass supports large zooplankton biomass at any point in time). Pyramid of Energy is the most reliable indicator of ecosystem structure.

4. Biodiversity Levels Genetic diversity — variation within a species (e.g., different rice varieties). Species diversity — number of different species in an area (measured by species richness and evenness). Ecosystem diversity — variety of ecosystems in a region. Alpha diversity (within habitat), Beta diversity (between habitats), Gamma diversity (regional or landscape scale). India is one of 17 mega-diverse countries — 7–8% of world’s species on 2.4% of world’s land area.

5. Keystone and Flagship Species Keystone species — has a disproportionately large effect on ecosystem relative to its biomass. Examples: sea otters (maintain kelp forests), elephants (create water holes, clear paths), wolves (Yellowstone trophic cascade), tigers (regulate prey populations). Flagship species — charismatic species used to promote conservation of a broader ecosystem. Examples: Bengal Tiger, Giant Panda, Snow Leopard. Umbrella species — whose conservation automatically protects many other species.

6. Biodiversity Hotspots Criteria (Norman Myers): must contain at least 1,500 endemic vascular plant species (>0.5% of world’s total) AND must have lost at least 70% of its original habitat. Currently 36 hotspots globally covering 2.5% of Earth’s surface but containing over 60% of world’s plant, bird, mammal, reptile, and amphibian species. India’s hotspots: Western Ghats and Sri Lanka, Himalaya, Indo-Burma, Sundaland (Andaman and Nicobar Islands). Know the location, endemic species, and current threats for each.

7. National Parks and Wildlife Sanctuaries National Park — highest protection, no human activity except tourism with permission, no grazing, no forestry. Wildlife Sanctuary — some human activities permitted (grazing, limited collection of forest produce). Tiger Reserve — designated under Project Tiger, includes core (critical tiger habitat) and buffer zones. Biosphere Reserve — UNESCO MAB designation, has core, buffer, and transition zones. Marine National Park — India’s first: Marine National Park, Gulf of Kutch (1982). High altitude NPs: Hemis (Ladakh, largest NP in India), Valley of Flowers, Nanda Devi.

8. Biosphere Reserves UNESCO Man and Biosphere (MAB) Programme — 738 biosphere reserves in 134 countries as of 2024. India has 18 biosphere reserves, of which 12 are UNESCO-recognised. Three zones: Core (no human activity), Buffer (limited research and education), Transition/Cooperation (sustainable use by local communities). Recently upgraded/listed Indian biosphere reserves are frequent Prelims questions. Know which are UNESCO-recognised: Nilgiri, Nanda Devi, Sundarbans, Gulf of Mannar, Simlipal, Dibru-Saikhowa, Dihang-Dibang, Pachmarhi, Agasthyamalai, Great Nicobar, Achanakmar-Amarkantak, Khangchendzonga, Panna.

9. Ramsar Sites Ramsar Convention on Wetlands — signed in Ramsar, Iran, 1971. Defines wetlands broadly to include lakes, rivers, swamps, marshes, floodplains, rice paddies, coral reefs, mangroves, estuaries. India has the highest number of Ramsar Sites in Asia — currently 85 sites (verify current figure as new sites are regularly added). Criteria for designation — 9 criteria including internationally important waterbirds, threatened ecological communities, fish support. Chilika Lake (Odisha) and Keoladeo Ghana (Rajasthan) were India’s first Ramsar sites (1981).

10. IUCN Red List Categories in decreasing order of threat: Extinct (EX), Extinct in the Wild (EW), Critically Endangered (CR), Endangered (EN), Vulnerable (VU), Near Threatened (NT), Least Concern (LC), Data Deficient (DD), Not Evaluated (NE). Know recently changed status of Indian species: Cheetah (Extinct in India, reintroduced), Snow Leopard (Vulnerable), Bengal Tiger (Endangered), Lion-Tailed Macaque (Endangered), Gharial (Critically Endangered), Great Indian Bustard (Critically Endangered), Indian Vulture (Critically Endangered).

11. Wildlife Protection Act 1972 Schedules — I and II (highest protection, no hunting), III and IV (protected but lesser penalty), V (vermin — can be hunted), VI (protected plants — no cultivation or possession). 2022 Amendment reduced schedules from 6 to 4. National Board for Wildlife (NBWL) — chaired by Prime Minister, apex body for wildlife conservation. Central Zoo Authority — regulates zoos in India. Species recovery programme for critically endangered species — Great Indian Bustard, Snow Leopard, Gangetic River Dolphin.

12. Environment Protection Act 1986 Passed in response to Bhopal Gas Tragedy (1984). Umbrella legislation — empowers Central Government to take measures to protect environment. EIA (Environmental Impact Assessment) Notification 2006 — projects require prior environmental clearance. Coastal Regulation Zone (CRZ) Notification — regulates development near coastlines. Eco-Sensitive Zones (ESZ) — buffer areas around Protected Areas. National Green Tribunal (NGT) Act 2010 — established NGT for speedy disposal of environmental cases.

13. Climate Change Basics IPCC (Intergovernmental Panel on Climate Change) — scientific body under UN, publishes assessment reports every 6–7 years. AR6 (Sixth Assessment Report, 2021–2022) — confirmed 1.1°C warming above pre-industrial levels. 1.5°C target — critical threshold beyond which irreversible tipping points may be triggered. India’s climate vulnerability — ranked among most climate-vulnerable countries due to dependence on monsoon, long coastline, Himalayan glaciers, and large population in climate-exposed areas.

14. Greenhouse Gases Main GHGs: Carbon Dioxide (CO2, 100-year GWP = 1), Methane (CH4, GWP = 28–36), Nitrous Oxide (N2O, GWP = 265–298), Hydrofluorocarbons (HFCs), Perfluorocarbons (PFCs), Sulphur Hexafluoride (SF6). Global Warming Potential (GWP) — measures how much heat a gas traps relative to CO2 over 100 years. Methane is 28 times more potent than CO2 but has a shorter atmospheric lifetime (12 years vs 100+ years for CO2). India’s GHG emissions — 4th largest emitter globally; per capita emissions are well below global average.

15. Carbon Markets and Carbon Credits Voluntary carbon market vs compliance carbon market. Carbon credit — one tonne of CO2 equivalent reduced or removed. Article 6 of Paris Agreement — framework for international carbon trading: Article 6.2 (bilateral deals between countries), Article 6.4 (UN-supervised global carbon market). Carbon Border Adjustment Mechanism (CBAM) — EU’s carbon tariff on imports from countries without carbon pricing — directly affects Indian exports of steel, aluminium, cement, fertilisers. India’s Carbon Credit Trading Scheme (CCTS) 2023 — India’s domestic carbon market framework.

16. UNFCCC and COP Meetings UNFCCC — United Nations Framework Convention on Climate Change, adopted 1992 Rio Earth Summit, entered into force 1994. 198 parties. Annual Conference of Parties (COP). Key COPs: COP3 Kyoto (1997) — Kyoto Protocol, binding targets for developed countries. COP21 Paris (2015) — Paris Agreement, NDCs, 1.5°C target, Loss and Damage. COP26 Glasgow (2021) — phase down of coal, methane pledge, COP27 Sharm el-Sheikh (2022) — Loss and Damage Fund agreed. COP28 Dubai (2023) — Global Stocktake, fossil fuel transition language. COP29 Baku (2024) — climate finance targets.

17. Paris Agreement Adopted at COP21 (2015), entered into force November 2016. Key features: NDCs (Nationally Determined Contributions) — each country sets its own targets, reviewed every 5 years; Long-Term Low-Emissions Development Strategies (LT-LEDS); Global Stocktake every 5 years to assess collective progress; Climate Finance — developed countries to mobilise $100 billion per year (target missed repeatedly); Loss and Damage — new fund for climate-vulnerable countries. India’s updated NDC (2022): 50% of installed electricity capacity from non-fossil sources by 2030, reduce emissions intensity of GDP by 45% from 2005 levels.

18. REDD+ Mechanism Reducing Emissions from Deforestation and Forest Degradation in Developing Countries. Plus elements: sustainable forest management, conservation of forest carbon stocks, enhancement of forest carbon stocks. Under UNFCCC. Safeguards — Cancun Safeguards — ensure REDD+ activities do not harm biodiversity or indigenous people. REDD+ results-based payments — countries receive payment for verified emissions reductions from forests. India’s forest cover — approximately 24% of geographical area (verify with latest India State of Forest Report).

19. Pollution — Air, Water, Noise Air Quality Index (AQI) — 6 categories: Good (0–50), Satisfactory (51–100), Moderately Polluted (101–200), Poor (201–300), Very Poor (301–400), Severe (401–500). 8 pollutants monitored: PM2.5, PM10, NO2, SO2, CO, O3, NH3, Pb. Water quality standards — BIS 10500, Central Pollution Control Board (CPCB) standards. Biological Oxygen Demand (BOD) — measure of organic pollution in water. National Clean Air Programme (NCAP) — target of 40% reduction in PM2.5 and PM10 by 2026 from 2017 baseline. Noise pollution — Noise Pollution (Regulation and Control) Rules 2000.

20. Conservation Projects Project Tiger (1973) — most successful wildlife conservation programme, 53 Tiger Reserves, tiger population grew from 1,827 (2014) to 3,167 (2022 census). Project Elephant (1992) — 33 Elephant Reserves, right of passage and mitigating human-elephant conflict. Project Snow Leopard — conservation in Himalayan states. Project Dolphin (2020) — Gangetic and marine dolphins. Project Lion — Asiatic lion conservation in Gir, Gujarat. Crocodile Conservation Project (1975) — three species: Mugger, Saltwater, Gharial. Sea Turtle Conservation — Olive Ridley turtles at Odisha coast.

Section 4: Geography — 14 Most Important Topics

1. Earth Structure and Geomorphology Internal structure — Crust (continental 35 km, oceanic 5–10 km), Mantle (upper and lower, up to 2900 km), Outer Core (liquid iron-nickel, responsible for Earth’s magnetic field), Inner Core (solid iron-nickel). Types of rocks: Igneous (intrusive — granite; extrusive — basalt), Sedimentary (sandstone, limestone, coal), Metamorphic (marble from limestone, quartzite from sandstone, slate from shale). Rock cycle — transformation between rock types through heat, pressure, and erosion.

2. Plate Tectonics Lithospheric plates — 7 major plates: Pacific, North American, South American, African, Eurasian, Australian, Antarctic. Types of plate boundaries: Convergent (subduction — oceanic-continental, collision — continental-continental, resulting in trenches and fold mountains), Divergent (mid-ocean ridges, continental rift valleys), Transform (strike-slip faults, lateral movement). Himalayan formation — collision of Indian Plate and Eurasian Plate beginning ~50 million years ago. Deccan Plateau — formed by volcanic activity on Indian Plate.

3. Volcanoes and Earthquakes Types of volcanoes: Shield (broad, gentle slopes, basaltic lava — Hawaiian type), Composite/Stratovolcano (steep, explosive, acidic lava — Vesuvius, Krakatoa), Cinder Cone (small, single vent, pyroclastic material). Ring of Fire — Pacific Ocean rim, 90% of world’s earthquakes and 75% of volcanoes. India’s only active volcano: Barren Island (Andaman and Nicobar Islands). Seismic zones — Zone II (least) to Zone V (most severe). Zone V covers Northeast India, Uttarakhand, Himachal Pradesh, J&K, Kutch region.

4. Climatology — Winds and Indian Monsoon Global wind systems: Trade Winds (equatorial to subtropical), Westerlies (subtropical to polar), Polar Easterlies (polar to subpolar). Jet Streams — fast-flowing air currents at tropopause level, influence monsoon. Indian Monsoon — Southwest Monsoon (June–September), Northeast Monsoon (October–December, affects southeast India). Onset of Southwest Monsoon over Kerala — typically June 1. El Niño — warming of Pacific Ocean waters, weakens Indian monsoon. La Niña — cooling of Pacific, strengthens monsoon. Indian Ocean Dipole (IOD) — temperature difference between western and eastern Indian Ocean, positive IOD enhances monsoon.

5. Ocean Currents Warm currents — flow from equator to poles (Gulf Stream, Kuroshio, North Atlantic Drift, Brazilian Current, Agulhas). Cold currents — flow from poles to equator (Labrador, California, Humboldt/Peru, Benguela, Oyashio, Canary). Effect of ocean currents: warm currents bring rainfall (western coasts of continents in tropical regions), cold currents bring deserts (western coasts in subtropical regions — Atacama, Namib, Sahara coastal). Upwelling — cold nutrient-rich water rises to surface, creates productive fishing grounds (Peru, California, Benguela).

6. Biomes of the World Tropical Rainforest — year-round rainfall, maximum biodiversity, Amazon, Congo, Southeast Asia. Tropical Deciduous Forest — seasonal rainfall, teak dominant, most of India’s forests. Tropical Grassland (Savanna) — Africa, Australia, South America. Temperate Grasslands — Prairies (N. America), Pampas (S. America), Steppes (Central Asia), Veld (S. Africa). Mediterranean — dry hot summers, mild wet winters, sclerophytic vegetation, fire-adapted. Taiga/Boreal Forest — coniferous forests, largest terrestrial biome. Tundra — treeless, permafrost, Arctic regions.

7. Indian Rivers and River Systems Himalayan Rivers — perennial (fed by snowmelt and glaciers), large discharge, high erosive power. Peninsular Rivers — seasonal (rain-fed), shorter, shallower. Indus System — Indus, Jhelum, Chenab, Ravi, Beas, Sutlej (6 rivers, Indus Waters Treaty 1960). Ganga System — Ganga, Yamuna, Chambal, Betwa, Ken, Son, Kosi, Gandak, Ghaghra. Brahmaputra System — longest river in India (within India), flows eastward in Tibet as Tsangpo, antecedent drainage. East-flowing Peninsular rivers — Mahanadi, Godavari, Krishna, Cauvery (delta formation). West-flowing — Narmada, Tapi (rift valleys, no delta).

8. Drainage Patterns Dendritic — irregular branching like tree branches, homogeneous terrain. Trellis — rectangular, alternate hard and soft rock bands. Rectangular — joints and faults control drainage direction. Radial — from central hill outwards (Amarkantak — Narmada, Son, Mahanadi originate here). Centripetal — drainage toward central depression (Loktak Lake, Sambhar Lake). Parallel — parallel streams on uniform slope. Antecedent drainage — river older than mountain it cuts through (Indus, Brahmaputra, Ganga at Gorges). Superimposed drainage — river imposed from above onto different rock structure.

9. Soil Types in India Alluvial Soil — most widespread, found in Indo-Gangetic Plains and river deltas, most fertile, khadar (new alluvium) and bhangar (old alluvium). Black Soil (Regur) — Deccan Plateau, cotton growing, self-ploughing, high water retention, formed from basaltic lava. Red and Yellow Soil — Eastern and Southern India, less fertile, iron oxide gives red colour. Laterite Soil — high rainfall areas, leaching removes nutrients, found in Western Ghats, Odisha, Meghalaya. Desert Soil — arid regions of Rajasthan, low organic matter. Mountain Soil — hill slopes, thin, low fertility.

10. Agriculture Geography Kharif crops — sown in June-July, harvested in October-November (rice, jowar, bajra, cotton, groundnut, jute, sugarcane). Rabi crops — sown in October-November, harvested in March-April (wheat, barley, mustard, gram, peas). Zaid crops — short duration between Rabi and Kharif (cucumber, watermelon, muskmelon). Green Revolution — wheat and rice, Punjab-Haryana belt, HYV seeds, irrigation, fertilisers. White Revolution — Operation Flood, milk production, NDDB, Dr. Verghese Kurien. Blue Revolution — fisheries. Yellow Revolution — oilseeds.

11. Mineral Resources Iron Ore — Jharkhand, Odisha, Chhattisgarh, Karnataka (Bellary-Hospet), Goa. Mica — Jharkhand, Rajasthan, Andhra Pradesh. Bauxite — Odisha, Jharkhand, Maharashtra, Chhattisgarh. Copper — Rajasthan (Khetri), Jharkhand (Singhbhum), Madhya Pradesh. Coal — Jharkhand (Jharia — largest coal field), Odisha, West Bengal, Madhya Pradesh, Chhattisgarh. Petroleum — Assam (oldest), Mumbai High (largest offshore), Rajasthan (Barmer), Gujarat. Uranium — Jharkhand (Jaduguda), Rajasthan, Andhra Pradesh, Meghalaya.

12. Mapping — Locations in News This is the highest-yield geography sub-topic for Prelims 2026. Practise locating on map: all Ramsar sites added in 2023–2026, conflict zones (Gaza, Red Sea, Strait of Hormuz, South China Sea), straits and waterways (Malacca, Hormuz, Bab-el-Mandeb, Suez Canal, Panama Canal, Palk Strait, Ten Degree Channel), ports in India (JNPT, Mundra, Kandla, Visakhapatnam, Chennai, Kochi, Paradip, Haldia), new railway corridors and expressways, countries in news (Sudan, Yemen, Ethiopia, Armenia, Niger, Mali, Chad).

13. World Geography Basics Continents and their features — highest peaks, longest rivers, largest deserts, major mountain ranges. Ocean geography — Pacific (largest), Atlantic (most-trafficked), Indian Ocean (most important for India). International Date Line — 180° meridian, day changes. Tropic of Cancer passes through 8 Indian states: Rajasthan, Gujarat, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura, Mizoram. Equator does not pass through India. Standard meridian of India — 82.5°E (5.5 hours ahead of GMT).

14. Disaster Management Basics Disaster Management Act 2005 — created National Disaster Management Authority (NDMA) chaired by Prime Minister, State DMA, District DMA. National Disaster Response Force (NDRF) — 16 battalions, under NDMA. Sendai Framework for Disaster Risk Reduction 2015–2030 — four priorities: understanding risk, strengthening governance, investing in resilience, enhancing preparedness. Cyclone naming — Bay of Bengal cyclones named by IMD, rotating system among 13 countries. India’s coastal vulnerability — 13 states/UTs have coastline, 7,516 km coastline.

Section 5: History — 15 Most Important Topics

1. Revolt of 1857 First War of Independence or Sepoy Mutiny — both terms used. Immediate cause: Enfield rifle cartridges greased with animal fat. Centres and leaders: Delhi (Bahadur Shah Zafar), Kanpur (Nana Sahib), Lucknow (Begum Hazrat Mahal, Birjis Qadr), Jhansi (Rani Lakshmibai), Bareilly (Khan Bahadur Khan), Arrah (Kunwar Singh). Suppression: British forces under General Neil, Havelock, Campbell, Outram. Outcome: End of East India Company rule, India directly under British Crown, India Act 1858.

2. Indian National Movement — Phases Moderate Phase (1885–1905): Founders — A.O. Hume, Dadabhai Naoroji, Surendranath Banerjea. Methods — petitions, prayers, delegations. Demand — administrative reforms within British framework. Extremist Phase (1905–1920): Bal Gangadhar Tilak, Bipin Chandra Pal, Lala Lajpat Rai (Lal-Bal-Pal). Methods — Swadeshi, boycott, national education, passive resistance. Partition of Bengal (1905) — immediate cause. Gandhian Phase (1920–1947): Non-Cooperation (1920–22), Civil Disobedience (1930–34), Quit India (1942).

3. Gandhian Movements Champaran Satyagraha (1917) — indigo planters, first successful civil disobedience. Kheda Satyagraha (1918) — peasants, revenue remission during flood. Ahmedabad Mill Strike (1918) — workers, first hunger strike by Gandhi. Non-Cooperation Movement (1920–22) — boycott of councils, courts, schools; returned from South Africa, began 1920; suspended after Chauri Chaura (1922) violence. Civil Disobedience / Salt March (1930) — Dandi March, March 12 – April 6, 1930, 241 miles in 24 days. Quit India (1942) — August 8–9, 1942, “Do or Die,” mass arrests of all Congress leaders.

4. Constitutional Developments — Acts Regulating Act 1773 — first step to Parliamentary control over EIC, created Governor-General post (Warren Hastings first). Pitt’s India Act 1784 — Board of Control, dual government. Charter Acts: 1813 (EIC monopoly ended except China trade), 1833 (all trade monopoly ended, Governor-General of India), 1853 (last charter act, civil services open to Indians). Government of India Acts: 1858 (Crown rule, Secretary of State), 1861 (Legislative Councils), 1892 (elections introduced), 1909 (Morley-Minto, separate electorates), 1919 (Montagu-Chelmsford, Dyarchy), 1935 (Provincial Autonomy, Federal structure, RBI, Federal Court).

5. Buddhism and Jainism Buddhism: Siddhartha Gautama (563–483 BCE), born Lumbini, Enlightenment at Bodh Gaya, First Sermon at Sarnath (Dhammachakkapavattana), Death at Kushinagar. Four Noble Truths, Eightfold Path. Three Jewels: Buddha, Dhamma, Sangha. Buddhist Councils: 1st Rajagriha, 2nd Vaishali, 3rd Pataliputra (Ashoka), 4th Kashmir (Kanishka). Jainism: Vardhamana Mahavira (599–527 BCE), 24th Tirthankara. Five vows: Ahimsa, Satya, Asteya, Brahmacharya, Aparigraha. Digambara vs Shvetambara sects.

6. Mauryan and Gupta Period Mauryan Empire (321–185 BCE): Chandragupta Maurya (founder, with Chanakya/Kautilya), Bindusara, Ashoka (273–232 BCE — Kalinga War 261 BCE, conversion to Buddhism, Dhamma). Arthashastra — Kautilya’s treatise on statecraft. Indica — Megasthenes’ account. Gupta Period (320–550 CE): Chandragupta I (founder), Samudragupta (conqueror), Chandragupta II (Vikramaditya — Golden Age). Fa-Hien visited during Chandragupta II. Aryabhata (zero, pi), Kalidasa (Abhijnanashakuntalam, Meghadutam), Sushruta (surgery), Charaka (medicine).

7. Bhakti and Sufi Movements Bhakti Movement: 6th–17th century, rejected caste distinctions, emphasised personal devotion over rituals. Key saints: Alvars (Tamil, Vaishnavite), Nayanars (Tamil, Shaivite), Ramanuja (Vishishtadvaita), Kabir (rejected both Hindu and Muslim orthodoxy), Mirabai (devotion to Krishna), Tukaram (Maharashtra), Nanak (Sikhism founded). Sufi Movement: Islamic mysticism, emphasis on love and devotion to God. Four main silsilas in India: Chishti (most popular — Moinuddin Chishti, Nizamuddin Auliya), Suhrawardiyya, Qadiriyya, Naqshbandiyya.

8. Temple Architecture Three main styles: Nagara (North India) — curvilinear tower (shikhara), no boundary wall. Dravida (South India) — pyramidal tower (gopuram/vimana), large compound wall, tank. Vesara (Deccan) — hybrid style. Examples: Nagara — Khajuraho (Chandela), Sun Temple Konark (Ganga), Somnath (Gujarat). Dravida — Brihadeeshwara Temple Thanjavur (Chola), Shore Temple Mahabalipuram (Pallava), Meenakshi Amman (Pandya). Rock-cut Architecture: Ajanta (Buddhist, paintings), Ellora (Buddhist, Hindu, Jain, all three religions), Elephanta (Hindu, Shiva).

9. Art and Culture Basics Classical Dances: Bharatanatyam (Tamil Nadu), Kathak (North India), Kathakali (Kerala), Kuchipudi (Andhra Pradesh), Odissi (Odisha), Manipuri (Manipur), Mohiniyattam (Kerala), Sattriya (Assam). Folk Dances: Garba (Gujarat), Bhangra/Giddha (Punjab), Bihu (Assam), Lavani (Maharashtra), Chhau (Jharkhand, Odisha, West Bengal). Classical Music: Hindustani (North) — Raga, Tala; Carnatic (South). UNESCO Intangible Cultural Heritage: Yoga, Kumbh Mela, Vedic Chanting, Chhau Dance, Ramlila, Durga Puja (2021), Garba (2023), Kolam (2024).

10. UNESCO World Heritage Sites in India India has 42 UNESCO World Heritage Sites (as of 2024) — 34 cultural, 7 natural, 1 mixed. Recent additions: Hoysala temples (2023), Santiniketan (2023). Natural sites: Kaziranga, Manas, Keoladeo, Sundarbans, Nanda Devi & Valley of Flowers, Western Ghats, Great Himalayan National Park. Cultural sites: Taj Mahal, Agra Fort, Fatehpur Sikri, Ajanta, Ellora, Hampi, Khajuraho, Mahabalipuram, Qutb Minar, Humayun’s Tomb, Red Fort, Jantar Mantar. Know which state each is in — a direct question type.

Section 6: Science and Technology — 10 Most Important Topics

1. Space Technology — ISRO Missions Chandrayaan-3 (2023) — successfully landed at lunar south pole, Pragyan rover. Vikram lander confirmed presence of sulphur, iron, oxygen, silicon, and other elements. Aditya-L1 — India’s first solar observatory, launched September 2023, reached L1 halo orbit January 2024. ISRO’s PSLV, GSLV, and LVM3 — know payload capacities and recent launches. Gaganyaan — India’s first crewed space mission, target 2025–2026. NISAR — joint NASA-ISRO synthetic aperture radar satellite, 2024 launch. Commercial space sector — IN-SPACe, NewSpace India Ltd (NSIL), private players (Skyroot, Agnikul).

2. Artificial Intelligence National Strategy for AI (NSAI) — NITI Aayog 2018 strategy focused on healthcare, agriculture, education, smart cities, smart mobility. IndiaAI Mission — Rs 10,372 crore programme announced in Union Budget 2024, includes compute infrastructure, datasets, application development, safety, and skilling. Generative AI — Large Language Models (LLMs), ChatGPT and similar systems. AI governance — India’s approach: innovation-first with guardrails rather than prescriptive regulation. Digital Personal Data Protection Act 2023 — data governance framework with AI implications. Global AI governance — AI Safety Summit (Bletchley Park 2023), Seoul AI Summit 2024.

3. Biotechnology and Genomics CRISPR-Cas9 — gene editing technology, Nobel Prize 2020 (Charpentier and Doudna). Applications in agriculture: GM crops, disease-resistant varieties. Applications in medicine: sickle cell disease treatment, cancer therapy. India’s Genomics: GenomeIndia Project — sequencing 10,000 Indian genomes to create reference dataset. National Biopharmaceutical Mission. Biosafety regulations — Genetic Engineering Appraisal Committee (GEAC) under MoEF&CC approves GM crop trials. Recent: DCGI approval process for gene therapy products.

4. Vaccines and Immunology Types of vaccines: Live attenuated (MMR, oral polio, BCG), Inactivated (IPV, Hepatitis A, flu), Toxoid (tetanus, diphtheria), Subunit/Protein (Hepatitis B, HPV), mRNA (COVID-19 — Pfizer, Moderna), Viral vector (COVID-19 — AstraZeneca, Sputnik V). Covaxin (India’s first indigenous COVID vaccine, BBV152, Bharat Biotech) — inactivated virus vaccine. Universal Immunisation Programme (UIP) — covers 12 vaccine-preventable diseases. PM eVIDYA and eVIN (Electronic Vaccine Intelligence Network) — cold chain management. National Immunisation Schedule — know vaccines given at birth, 6 weeks, 10 weeks, 14 weeks, 9 months, 16–24 months.

5. Defence Technology Agni Missile Series — ballistic missiles. Agni-V (ICBM class, range >5000 km, MIRV capability confirmed 2024 — Mission Divyastra). BrahMos — supersonic cruise missile (joint India-Russia), BrahMos-ER (extended range), BrahMos-NG (next generation). Pinaka — multi-barrel rocket launcher. DRDO — Defence Research and Development Organisation, key laboratories. DAP 2020 (Defence Acquisition Procedure) — 75% domestic procurement requirement. iDEX (Innovations for Defence Excellence) — startups in defence. India-US INDUS-X — initiative for defence technology co-development.

6. Nanotechnology Nanomaterials — materials with at least one dimension in 1–100 nanometre range. Carbon nanotubes, graphene, quantum dots, nanoparticles. Applications: Drug delivery (targeted cancer therapy), water purification (nano-filters), textiles (antimicrobial fabrics), electronics (smaller transistors), solar cells (higher efficiency). National Mission on Nano Science and Technology (Nano Mission) — under DST. Safety concerns — nanotoxicology, environmental impact of nanoparticles. India’s National Nanotechnology Initiative.

7. Cybersecurity CERT-In (Computer Emergency Response Team India) — national nodal agency for cybersecurity incidents, under MeitY. Personal Data Protection: Digital Personal Data Protection Act 2023. National Cybersecurity Policy 2013 — under revision. National Critical Information Infrastructure Protection Centre (NCIIPC) — protects critical infrastructure. Cyber Surakshit Bharat. Types of cyber attacks: Phishing, Ransomware (WannaCry, NotPetya), DDoS (Distributed Denial of Service), Zero-day exploits, Social Engineering. India’s rank in Global Cybersecurity Index (GCI) — improved significantly.

8. Emerging Technologies Quantum Computing — uses quantum bits (qubits), superposition, and entanglement. National Quantum Mission (NQM) — Rs 6,003 crore, 2023–2031, targets 50–1000 qubit computers. Semiconductor Mission — India Semiconductor Mission (ISM), Rs 76,000 crore incentive package, Micron Technology (US), Tata Electronics, CG Power-Renesas setting up fabs. 5G rollout — India completed 5G rollout across all 22 telecom circles. 6G research — Bharat 6G Vision document. Blockchain — decentralised ledger technology, applications in land records, supply chain, digital identity.

9. Nuclear Technology Three-Stage Nuclear Programme (Dr. Homi Bhabha): Stage 1 — natural uranium fuel PHWRs (Pressurised Heavy Water Reactors), Stage 2 — fast breeder reactors using plutonium from Stage 1 spent fuel, Stage 3 — thorium-uranium-233 cycle. India has world’s largest thorium reserves. Nuclear Power Corporation of India (NPCIL). Kudankulam Nuclear Power Plant (Russian collaboration). India-US Civil Nuclear Deal (2008) — 123 Agreement, IAEA Safeguards Agreement. Nuclear Suppliers Group (NSG) — India not yet a member despite US support. Comprehensive Test Ban Treaty (CTBT) — India has not signed.

10. Digital India and Technology Governance Digital Public Infrastructure (DPI) — India Stack: Aadhaar (identity), UPI (payments), DigiLocker (documents), CoWIN (health), ONDC (commerce), Account Aggregator (financial data). India’s DPI model being adopted globally. ONDC (Open Network for Digital Commerce) — open protocol for e-commerce, reduces dependence on platform oligopolies. GeM (Government e-Marketplace) — public procurement platform, over Rs 2 lakh crore GMV. Semiconductor and display manufacturing: chips are now a national security issue globally. India’s data governance: Digital Personal Data Protection Act 2023, Non-Personal Data Governance Framework.

Most Important Current Affairs Topics for UPSC Prelims 2026

Current affairs accounts for 15–20 questions and is where well-prepared aspirants differentiate themselves. These are the themes where current events are most likely to generate Prelims questions.

International Conflicts and Geopolitics

• West Asia Conflict 2026 — Operation Epic Fury, Strait of Hormuz closure, India’s response and Strategic Autonomy
• Russia-Ukraine War — NATO enlargement, sanctions, grain deal, energy implications for Europe and India
• Iran-Israel conflict — direct military exchanges, implications for global oil markets
• India-China border developments — Galwan, LAC disengagement, Doklam, Eastern Ladakh
• Indo-Pacific — QUAD, AUKUS, South China Sea disputes, Taiwan Strait

Government Schemes and Initiatives

• PM Gati Shakti National Master Plan
• PM Vishwakarma Scheme
• Green Hydrogen Mission
• Digital India and India Stack
• PLI Schemes across 14 sectors

Environment and Climate

• COP29 Baku outcomes
• Global Biodiversity Framework (Kunming-Montreal) implementation
• New Ramsar Sites in India
• Project Cheetah progress update
• Great Indian Bustard conservation and Supreme Court order on power lines

Science and Technology

• Chandrayaan-3 and Aditya-L1 mission findings
• Gaganyaan mission updates
• National Quantum Mission progress
• India Semiconductor Mission — new fabs announced
• AI governance — IndiaAI Mission

Important Reports and Indices

• Human Development Report (UNDP) — India’s rank and HDI value
• Global Hunger Index — India’s rank and methodology controversy
• World Happiness Report — India’s rank
• Global Innovation Index — India’s rank
• Environmental Performance Index
• Economic Survey 2025–26 themes

Bills and Governance

• Digital Personal Data Protection Act 2023 implementation
• Three new Criminal Laws — BNS, BNSS, BSA (replacing IPC, CrPC, Indian Evidence Act)
• Chief Election Commissioner Act 2023
• Women’s Reservation Act (106th Amendment) implementation timeline
• Forest Conservation Amendment Act

60-Day Revision Strategy for UPSC Prelims 2026

This is your week-by-week plan for the final 60 days. Do not add new sources. Revise what you have, practice MCQs daily, and take full-length mocks every weekend.

Week 1 — Polity and Economy Revise all 20 Polity topics with special focus on constitutional provisions, important Article numbers, and landmark Supreme Court judgments. For Economy, revise monetary and fiscal policy frameworks, GST structure, and all major government schemes. Attempt 50 Polity PYQs and 30 Economy PYQs from 2015–2025.

Week 2 — History and Art & Culture Complete Modern History (1857 to Independence), focusing on all Gandhian movements, constitutional acts, and Congress sessions. For Ancient and Medieval, focus on Mauryan-Gupta period, Bhakti-Sufi movements, and temple architecture styles. Revise all classical dances, UNESCO heritage sites, and cultural geography. Attempt 50 History PYQs from 2015–2025.

Week 3 — Geography and Environment Complete physical geography — geomorphology, plate tectonics, climatology, ocean currents — with map work. Revise all Indian rivers, soil types, mineral distribution, and agriculture geography. For Environment, complete all 20 topics with special focus on protected areas, Ramsar sites, IUCN Red List, and climate conventions. Attempt 50 Geography and 50 Environment PYQs.

Week 4 — Science and Technology and Current Affairs Cover all 10 S&T topics with emphasis on ISRO missions, AI, biotechnology, defence technology, and digital infrastructure. For Current Affairs, revise all topics from the current affairs section above — geopolitics, government schemes, environment news, S&T developments, and important reports. Attempt 30 S&T PYQs and 50 current affairs practice questions.

Week 5 — Full-Length Mock Tests and Weak Areas Take minimum 4 full-length mock tests (100 questions, 200 marks, 2 hours). After each mock, spend equal time on analysis — identify which subjects and topics are causing errors. Focus remaining study time exclusively on topics where you are scoring below 50%. Do not revise topics you already know well — that time is better spent on weak areas.

Week 6 — Rapid Revision and Final PYQ Sprint Do a fast second revision of all 100 topics — use your notes, not textbooks. Solve the last 5 years of UPSC Prelims PYQs Paper I in timed conditions. Revise all important numbers, dates, Article numbers, and scheme details that you tend to forget. In the last 3 days before the exam — no new material, only confidence revision of your strongest topics.

Daily routine throughout these 60 days:

• Morning — 2 hours of subject revision
• Afternoon — 30–40 MCQ practice questions
• Evening — 1 hour current affairs (newspaper + monthly compilation)
• Night — 20-minute rapid revision of the day’s topics

Frequently Asked Questions