March 26, 20268 min read

UPSC Syllabus 2026: Complete Prelims and Mains Syllabus with Topic-Wise Breakdown

Full UPSC CSE syllabus for 2026 covering Prelims GS and CSAT, Mains all 9 papers, topic-wise weightage analysis, and how to map syllabus to your study plan.

UPSC syllabus UPSC CSE Prelims syllabus Mains syllabus IAS exam

The single biggest mistake UPSC aspirants make is starting preparation without fully understanding the syllabus. They pick up a book, start reading, and three months later realize they've covered topics that carry almost no weightage — while ignoring areas that appear every year.

Here's the complete UPSC Civil Services Examination syllabus for 2026, broken down topic-wise with weightage analysis from the past five years. This is your map. Study it before you study anything else.

Prelims: Paper I — General Studies (200 marks)

Prelims Paper I is the make-or-break stage. 100 questions, 2 marks each, 0.67 negative marking per wrong answer. You need to clear the cutoff (typically 90–105 marks depending on the year) to reach Mains.

Topic-Wise Breakdown

Topic	Sub-Topics	Avg. Questions (Last 5 Years)	Weightage
History	Ancient, Medieval, Modern India, Art & Culture	15–18	16%
Geography	Physical, Indian, World Geography	12–15	14%
Polity & Governance	Constitution, Panchayati Raj, Public Policy, Rights	12–15	14%
Economy	Macro, Micro, Budget, Banking, Agriculture	12–16	15%
Environment & Ecology	Biodiversity, Climate Change, Environmental Laws	10–14	12%
Science & Technology	Space, Defence, Biotech, IT, Health	8–12	10%
Current Affairs	National, International, Government Schemes	15–20	19%

What this tells you: Current Affairs and History together account for about 35% of the paper. Environment has been increasing in weightage over the past three years. Science & Technology questions are often current-affairs-based rather than pure science.

Key Topics That Repeat Every Year

Modern Indian History (especially the freedom struggle and social reform movements)
Indian Constitution: Fundamental Rights, DPSPs, Amendment procedures
Government schemes related to agriculture, health, and education
International organizations and India's role
Biodiversity hotspots, national parks, wildlife sanctuaries
Space missions (ISRO launches, international collaborations)

Prelims: Paper II — CSAT (200 marks, Qualifying)

CSAT is qualifying with a 33% cutoff (66 marks out of 200). You don't need to score high — just clear the threshold. But every year, some candidates fail here due to overconfidence.

Topic	Sub-Topics	Avg. Questions
Comprehension	English passages, inference, summary	25–30
Logical Reasoning	Statements-Conclusions, Assumptions, Syllogisms	15–18
Analytical Ability	Data patterns, sequences, puzzles	10–12
Decision Making	Ethical dilemmas, administrative scenarios	5–8
Basic Numeracy	Arithmetic, Percentages, Ratios, Averages	10–15
Data Interpretation	Tables, Graphs, Charts	8–10
English Language	Grammar, Vocabulary (for comprehension)	Integrated

CSAT strategy: If you're comfortable with English comprehension and basic maths, a week of practice papers is enough. If you struggle with maths, dedicate 2–3 weeks to arithmetic fundamentals. Don't let CSAT become a bottleneck.

Mains: Complete Paper Structure (1750 marks)

Mains is where your rank is determined. It consists of 9 papers, but only 7 count toward ranking.

Paper	Subject	Marks	Counts for Ranking?
Paper A	Indian Language (from list)	300	No (Qualifying)
Paper B	English	300	No (Qualifying)
Paper I	Essay	250	Yes
Paper II	GS I (History, Geography, Society)	250	Yes
Paper III	GS II (Polity, Governance, IR)	250	Yes
Paper IV	GS III (Economy, Science, Environment, Security)	250	Yes
Paper V	GS IV (Ethics, Integrity, Aptitude)	250	Yes
Paper VI	Optional I	250	Yes
Paper VII	Optional II	250	Yes

Total ranking marks: 1750 (Essay + GS I-IV + Optional I-II)

Mains GS Paper I: History, Geography, and Society

This paper tests your understanding of Indian heritage, world history, geography, and social issues.

Indian Heritage and Culture: Art forms, literature, architecture from ancient to modern times. Expect questions on classical dances, temple architecture, literary works, and UNESCO heritage sites. Modern Indian History: From the mid-18th century to the present — freedom struggle, social reform, post-independence consolidation. This is heavily tested. Know the timeline, key personalities, and the ideological currents. World History: 18th century onwards — Industrial Revolution, World Wars, colonization and decolonization, political philosophies (communism, capitalism, socialism), globalization. Indian Society: Salient features of Indian society, diversity, role of women, population issues, urbanization, communalism, regionalism, secularism. Geography: Physical geography (geomorphology, climatology, oceanography), human geography (resource distribution, primary/secondary/tertiary activities), and India-specific topics (monsoon, river systems, minerals, agriculture patterns).

Mains GS Paper II: Polity, Governance, and International Relations

Indian Constitution: Historical underpinnings, evolution, features, amendments, significant provisions, basic structure doctrine. Know landmark Supreme Court judgments. Governance: Government policies, development processes, e-governance, transparency, accountability. Separation of powers, judicial activism, welfare schemes for vulnerable sections. International Relations: India's foreign policy, regional groupings (SAARC, ASEAN, BRICS, G20), bilateral relations (India-US, India-China, India-Pakistan), diaspora.

Mains GS Paper III: Economy, Science, Environment, and Security

Economy: Indian economy, planning, resource mobilization, inclusive growth, budgeting, food security, agriculture, industry, infrastructure, investment models. Science & Technology: IT, space, biotechnology, intellectual property rights. Environment: Conservation, biodiversity, climate change, international agreements. Security: Extremism, border challenges, cyber security, organized crime.

Mains GS Paper IV: Ethics, Integrity, and Aptitude

This is the most unique paper in UPSC Mains — and often the most underestimated. Covers ethics and human interface, attitude, foundational values (integrity, impartiality, objectivity), emotional intelligence, and case studies. Typically 6 case studies worth 20–25 marks each testing your ability to analyze ethical dilemmas in governance.

Topic-Wise Weightage: Past 5 Years Analysis

Here's where preparation gets strategic. Not all topics are equal.

Topic Area	Avg. Marks in Prelims	Avg. Marks in Mains	Priority Level
Modern Indian History	18–22	30–40	Very High
Indian Polity	16–20	40–50	Very High
Indian Economy	16–22	35–45	Very High
Geography	14–18	25–35	High
Environment & Ecology	12–16	20–30	High
Current Affairs	20–28	30–50	Very High
Science & Technology	10–14	15–25	Medium
Art & Culture	6–10	10–15	Medium
Ethics (Mains only)	—	200–250	Very High

The takeaway: Polity, Economy, Modern History, and Current Affairs are the four pillars. If you're strong in these four, you'll clear Prelims and score well in at least 3 out of 4 GS Mains papers.

How to Map This Syllabus to a Study Plan

Let's be practical about it:

Month 1–3: Cover NCERTs for History, Geography, Polity, Economy, and Science (Class 6–12)
Month 4–6: Standard reference books — Laxmikanth for Polity, Spectrum for Modern History, Ramesh Singh for Economy, Majid Husain for Geography
Month 7–9: Environment (Shankar IAS), Science & Tech (current affairs based), Ethics (Lexicon), Optional Subject
Month 10–12: Answer writing, mock tests, revision, current affairs consolidation
Last 2 months before Prelims: Prelims-focused revision — previous year questions, mock tests, current affairs of last 12 months

Official Syllabus Link

The official UPSC CSE syllabus is available on upsc.gov.in under the "Examinations" section. Download the PDF and keep it accessible throughout your preparation. Every time you finish a topic, tick it off on the official syllabus document. This gives you a clear visual of how much ground you've covered.

FAQ

Does the UPSC syllabus change every year?

No. The syllabus has remained essentially the same since 2013 (when CSAT was introduced and the Mains pattern was revised). What changes is the focus — some topics trend more in certain years based on current events and the chairman's preferences.

How many topics should I cover before starting Prelims mock tests?

At least 60–70% of the Prelims syllabus. If you start mocks too early, the low scores will demotivate you. If you start too late, you won't build exam temperament. Month 6–7 is usually the right time.

Is the optional subject syllabus also fixed by UPSC?

Yes. UPSC provides a detailed syllabus for each of the 48 optional subjects. Download it from upsc.gov.in. Your optional strategy should be based on this syllabus, not on coaching modules which sometimes include unnecessary topics.

How important is Art & Culture in the syllabus?

It carries 6–10 marks in Prelims and appears in GS Paper I of Mains. It's not the highest priority, but ignoring it completely is risky. Cover the basics from NCERT Fine Arts book and a standard compilation — don't spend more than 2–3 weeks on it.

Download the official UPSC syllabus and start mapping your preparation at SarkariNaukriHub.