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The UPSC CSE Prelims syllabus forms the bedrock of every serious IAS preparation plan. Without a thorough understanding of what the Union Public Service Commission prescribes, even hardworking aspirants risk studying outside the examination's scope or underweighting critical subjects. The Prelims syllabus, as released in the official notification by UPSC, covers two papers: General Studies Paper 1 (GS Paper 1) and General Studies Paper 2 (CSAT). This page provides a complete, topic-wise breakdown of both papers along with subject-specific preparation guidance.
To track which topics you have completed, use the Aspirant Mitraa Syllabus Tracker, which is designed specifically for UPSC CSE preparation.
As specified in the official UPSC notification, the Prelims examination consists of two compulsory papers:
| Paper Name Marks Questions Nature | ||||
| GS Paper 1 | General Studies | 200 | 100 | Merit-determining |
| GS Paper 2 | CSAT | 200 | 80 | Qualifying (33% minimum) |
Both papers are conducted on the same day in two separate sessions. GS Paper 1 is held in the morning session (9:30 AM to 11:30 AM) and CSAT in the afternoon session (2:30 PM to 4:30 PM).
The official UPSC syllabus for GS Paper 1 covers the following broad subject areas:
Each of these broad areas encompasses a wide range of specific topics that have been repeatedly tested across UPSC Prelims papers from 2011 to the present.
Current Affairs is the most dynamic component of GS Paper 1 and typically contributes 15 to 25 questions in each Prelims cycle. The Commission does not prescribe a fixed syllabus for Current Affairs, which means aspirants must maintain awareness of events and developments across a range of domains.
Key areas within Current Affairs for UPSC Prelims:
| Domain What to Cover | |
| Government Schemes and Policies | Launch details, beneficiaries, implementing ministry, budget allocation |
| International Relations | India's bilateral relationships, trade agreements, multilateral organisations |
| Reports and Indices | Global Hunger Index, Human Development Index, World Economic Outlook |
| Awards and Recognitions | Bharat Ratna, Nobel Prize, Padma Awards, international honours |
| Sports and Events | Olympics, Commonwealth Games, major tournaments |
| Science and Technology Developments | ISRO missions, AI policies, health technology breakthroughs |
| Environment and Climate Negotiations | COP summits, biodiversity treaties, India's commitments |
| Economy | RBI policies, Budget highlights, new trade agreements |
| Social Sector | Education policies, health metrics, poverty reduction data |
The most reliable sources for Current Affairs are The Hindu newspaper, Indian Express, PIB (Press Information Bureau) daily releases, Yojana and Kurukshetra magazines, and Economic Survey.
Practice Current Affairs-based PYQs from the UPSC Prelims Current Affairs Questions section on Aspirant Mitraa.
History questions in UPSC Prelims draw from three broad segments: Ancient India, Medieval India, and Modern India (with Indian National Movement as a subset of Modern India).
| Topic Key Areas | |
| Prehistoric Cultures | Palaeolithic, Mesolithic, Neolithic, Chalcolithic |
| Indus Valley Civilisation | Major sites, trade, social structure, religion |
| Vedic Period | Rigvedic and Later Vedic periods, social organisation |
| Mauryan Empire | Ashoka's policies, Arthashastra, administrative system |
| Post-Mauryan Period | Kushanas, Satavahanas, art and architecture |
| Gupta Period | Administration, trade, cultural achievements |
| South Indian Kingdoms | Cholas, Pallavas, Chalukyas, art forms |
| Religious Movements | Buddhism, Jainism, Bhakti and Sufi movements |
| Topic Key Areas | |
| Delhi Sultanate | Major dynasties, administrative system, culture |
| Mughal Empire | Akbar's policies, Mansabdari system, Aurangzeb |
| Provincial Kingdoms | Vijayanagara Empire, regional powers |
| Bhakti and Sufi Movements | Key saints, their teachings, social impact |
| Architecture | Temples, mosques, forts, Indo-Islamic style |
| Topic Key Areas | |
| European Advent | Portuguese, Dutch, French, British East India Company |
| British Conquest | Battles of Plassey and Buxar, Subsidiary Alliance, Doctrine of Lapse |
| Economic Impact of British Rule | Drain of wealth, deindustrialisation, land revenue systems |
| Social Reforms | Ram Mohan Roy, Brahmo Samaj, Arya Samaj, widow remarriage |
| Early Nationalism | Indian National Congress, Moderate and Extremist phases |
| Gandhi and Mass Movements | Non-Cooperation, Civil Disobedience, Quit India |
| Revolutionary Nationalism | Bhagat Singh, Chandrashekhar Azad, INA |
| Constitutional Developments | Government of India Acts 1919 and 1935 |
| Partition and Independence | Cabinet Mission, Indian Independence Act 1947 |
Practise History PYQs from the UPSC Prelims History Questions section.
Geography in UPSC Prelims covers both Physical Geography (landforms, climate, rivers, soils, vegetation) and Human Geography (population, settlements, economy). Questions are drawn from both Indian Geography and World Geography.
| Topic Key Areas | |
| Earth and Universe | Origin, internal structure, plate tectonics |
| Landforms | Mountains, plateaus, plains, glaciers, rivers |
| Climate | Factors affecting climate, monsoon system, climate zones |
| Soils | Types of soils in India, degradation, conservation |
| Drainage System | Himalayan and Peninsular rivers, river basins |
| Natural Vegetation | Forest types, biomes, vegetation zones |
| Oceans | Ocean currents, tides, coral reefs, El Nino effect |
| Topic Key Areas | |
| Physiographic Divisions | Himalayas, Indo-Gangetic Plain, Deccan Plateau, Coastal Plains |
| Climate of India | Monsoon mechanics, seasonal patterns, ITCZ |
| Water Resources | Major rivers, dams, river linking projects |
| Agriculture | Cropping patterns, crop types, irrigation methods |
| Minerals and Energy | Coal, iron, petroleum resources and distribution |
| Industries | Location factors, major industrial regions |
| Transport | Road, rail, waterway, air connectivity |
| Topic Key Areas | |
| Physical Divisions | Major mountain ranges, rivers, deserts, plains |
| Climatology | World climate types, global warming impact |
| Economic Geography | Regions of agricultural and industrial importance |
| Geopolitics | Strategic locations, chokepoints, island territories |
Practise Geography PYQs from the UPSC Prelims Geography Questions section.
Polity is one of the highest-weightage subjects in UPSC Prelims, consistently contributing 10 to 15 questions. The primary reference text is M. Laxmikanth's Indian Polity.
| Topic Key Subtopics | |
| Constitution of India | Historical background, Constituent Assembly, Preamble |
| Constitutional Bodies | President, Parliament, Supreme Court, Election Commission, CAG |
| Fundamental Rights | Articles 12 to 35, landmark judgments |
| Directive Principles | Articles 36 to 51, relationship with Fundamental Rights |
| Fundamental Duties | Article 51A |
| Federalism | Centre-State relations, Article 356, Inter-State Council |
| Parliamentary System | Rajya Sabha, Lok Sabha, powers and procedures |
| Judiciary | Supreme Court, High Courts, judicial review, PIL |
| Local Governance | 73rd and 74th Amendments, Panchayati Raj |
| Emergency Provisions | Articles 352, 356, 360 |
| Constitutional Amendments | Important amendments and their implications |
| Statutory Bodies | UPSC, NHRC, CIC, Lokpal, SEBI, RBI |
Practise Polity PYQs from the UPSC Prelims Indian Polity and Governance Questions section.
Economy questions in UPSC Prelims cover both fundamental economic concepts and contemporary economic developments in India.
| Topic Key Subtopics | |
| National Income | GDP, GNP, NNP, fiscal deficit, current account deficit |
| Planning in India | Five-Year Plans, NITI Aayog, planning commission |
| Money and Banking | RBI functions, monetary policy tools, NBFC, Lok Adalat |
| Budget and Taxation | Direct and indirect taxes, GST structure, Union Budget |
| Agriculture | Green Revolution, subsidies, farm credit, APMC |
| Poverty and Inequality | Poverty lines, MGNREGA, social security schemes |
| Infrastructure | Roads, power sector, digital economy |
| Trade and External Sector | Balance of payments, WTO, FDI policy |
| Social Sector | Health indices, education policy, SDGs |
Practise Economy PYQs from the UPSC Prelims Economy Questions section.
Environment and Ecology has emerged as one of the most heavily tested sections in UPSC Prelims over the last five to six years. The Commission has progressively increased the number of questions from this area.
| Topic Key Subtopics | |
| Ecology Fundamentals | Food chains, food webs, trophic levels, energy flow |
| Biomes | Tropical forests, grasslands, deserts, tundra |
| Biodiversity | Types of biodiversity, hotspots, endemic species |
| Protected Areas | National parks, wildlife sanctuaries, biosphere reserves |
| Conservation | Project Tiger, Project Elephant, wetland conservation |
| Climate Change | Greenhouse gases, IPCC reports, Paris Agreement |
| International Conventions | CITES, Ramsar, CBD, Basel Convention |
| Pollution | Air, water, soil, noise pollution and regulations |
| Government Policies | Forest Rights Act, Environment Protection Act |
Practise Environment PYQs from the UPSC Prelims Environment and Ecology Questions section.
Science questions in UPSC Prelims are drawn from Physics, Chemistry, Biology, and current Science and Technology developments. The standard for GS science questions is approximately up to Class 10 NCERT level, while Science and Technology questions can go beyond.
| Topic Key Subtopics | |
| Biology | Cell biology, genetics, disease, human physiology, nutrition |
| Physics | Light, sound, electricity, nuclear energy basics |
| Chemistry | Acids and bases, metals, everyday chemistry |
| Space Technology | ISRO missions, satellite categories, space exploration |
| Defence Technology | DRDO projects, missiles, defence systems |
| Information Technology | AI, blockchain, cloud computing, cybersecurity policy |
| Biotechnology | GM crops, stem cells, CRISPR, vaccine technology |
| Health and Medicine | Major diseases, vaccines, WHO reports, AYUSH |
| Nuclear Technology | Types of reactors, India's nuclear policy |
Practise Science and Technology PYQs from the UPSC Prelims Science and Technology Questions section.
The CSAT syllabus, as specified by UPSC, includes:
CSAT carries 80 questions for 200 marks. Since CSAT is only qualifying (33% minimum), aspirants must secure at least 66 marks, but it is strategically sound to target 90 to 100 marks to maintain a comfortable buffer.
Reading comprehension typically accounts for 30 to 40 questions in CSAT. Passages are drawn from economics, social sciences, philosophy, and current affairs. The questions test:
Practise comprehension questions from the UPSC Prelims Reading Comprehension Questions section.
| Topic Examples | |
| Syllogisms | All A are B type deductions |
| Series Completion | Number, letter, figure series |
| Analogies | Conceptual and word-based |
| Blood Relations | Family tree problems |
| Coding-Decoding | Letter and number codes |
| Direction and Distance | Spatial reasoning |
| Arrangements | Linear and circular seating |
| Critical Reasoning | Strengthen, weaken, assumption-based questions |
Practise from the UPSC Prelims Reasoning and Logical Ability Questions section.
| Topic Key Areas | |
| Number System | LCM, HCF, divisibility rules |
| Percentages | Profit and loss, discount |
| Ratio and Proportion | Mixtures, alligation |
| Time, Speed, and Distance | Trains, boats |
| Simple and Compound Interest | Instalment problems |
| Data Interpretation | Tables, bar graphs, pie charts, line graphs |
Practise from the UPSC Prelims Quantitative Aptitude Questions section.
| Subject Primary Source Secondary Source | ||
| History (Ancient and Medieval) | NCERT Class 6 to 12 | Spectrum Modern History |
| History (Modern and Freedom Movement) | Spectrum Modern History by Rajiv Ahir | NCERT Class 12 |
| Geography | NCERT Class 6 to 12 | G.C. Leong's Physical Geography |
| Polity | M. Laxmikanth's Indian Polity | PRS Legislative Research |
| Economy | NCERT Class 11-12 Economics | Economic Survey (current year) |
| Environment | NCERT Class 11-12 Biology | Shankar IAS Environment |
| Science and Technology | NCERT Class 6 to 10 | PIB Science and Tech updates |
| Current Affairs | The Hindu / Indian Express | Yojana, Kurukshetra magazines |
While the actual time split depends on individual strengths, the following is a general guide:
| Subject Recommended Time (Full Preparation Cycle) | |
| Current Affairs | Daily reading (30 to 45 minutes) + monthly consolidation |
| Polity | 4 to 5 weeks for complete Laxmikanth |
| History | 6 to 8 weeks covering all three periods |
| Geography | 5 to 6 weeks for Indian and World Geography |
| Economy | 4 to 5 weeks with daily current affairs overlap |
| Environment | 3 to 4 weeks with active PYQ revision |
| Science and Technology | 2 to 3 weeks for static + ongoing current affairs |
| CSAT | 30 to 45 minutes daily throughout preparation |
Reading standard sources builds knowledge, but mock tests reveal how that knowledge translates under examination conditions. The UPSC CSE Prelims Test Series on Aspirant Mitraa offers 400 tests structured to align with the official syllabus:
This structure ensures that revision is active rather than passive, and that concept retention is tested systematically throughout the preparation journey.
Studying beyond the syllabus scope: UPSC questions on science, for instance, rarely go beyond Class 10 level for static topics. Spending disproportionate time on advanced physics or chemistry is a common preparation error.
Ignoring CSAT: Since CSAT has only a qualifying threshold, many aspirants prepare minimally for it. A surprise difficult paper, as seen in 2023, can eliminate otherwise strong GS performers. Always maintain CSAT practice.
Treating Current Affairs as separate from Static: UPSC increasingly frames current affairs questions that require static background knowledge. Practising subject-wise PYQs helps identify the kind of static-current link UPSC creates.
Not tracking syllabus completion: Use the Aspirant Mitraa Syllabus Tracker to maintain a structured record of completed and pending topics.
Does the UPSC Prelims syllabus change every year? The official syllabus as prescribed by UPSC does not change year to year. However, the emphasis on specific topics within the syllabus shifts based on current events and the Commission's assessment priorities.
How many subjects are there in GS Paper 1? GS Paper 1 broadly covers seven subject areas: History, Geography, Polity, Economy, Environment, Science, and Current Affairs.
Is CSAT tougher than GS Paper 1? CSAT tests a different set of skills - aptitude, reasoning, and numeracy rather than general knowledge. For candidates with a non-mathematics background, CSAT can be challenging. Regular practice using previous year CSAT questions is essential.
Can the entire GS Paper 1 syllabus be covered in 6 months? Yes, with a structured daily study schedule of 8 to 10 hours, a disciplined aspirant can complete the core GS Paper 1 syllabus within 5 to 6 months, leaving time for revision and mock tests.
What is the most important subject in GS Paper 1? No single subject dominates GS Paper 1 consistently. However, Polity, Environment, and History have shown high and relatively stable weightage over the last decade of UPSC Prelims papers.
The UPSC CSE Prelims syllabus is wide but not unstructured. Every topic on this page connects to a verified pattern of questions asked by the Commission. Systematic study, combined with regular PYQ practice and mock testing, is the most reliable route to Prelims qualification.