Target: CSE 2027Gazette-aligned frameworkPrelims + Mains + InterviewWeightage · Booklist · FAQs

UPSC Syllabus 2027 — Prelims & Mains GS I–IV Complete Map

Structured UPSC CSE syllabus for Prelims and Mains GS I–IV, with links into the free Shelf Learn curriculum and personal library setup.

Exam structure

3-stage master ledger · 2,025 total marks

Prelims negative-marking score simulator

Live · 1/3rd penalty

Model attempt scenarios for GS Paper I and CSAT with official-style marking.

Correct
+2.00 × 68
Wrong
−0.67 × 17
Blank
0 × 15
Estimated net score
124.67 / 200

Accuracy 80% · Score 62.3% of paper

Comfortable vs recent Gen cut-offs

Formula: Net = (Correct × 2.00) − (Wrong × 0.667). Illustrative only — confirm marking in the official notification.

Stage 1 of 3

Prelims syllabus 2027 · Objective · 400 marks

Two compulsory papers on one day (GS morning, CSAT afternoon). Clear CSAT at 33% and the GS-I category cut-off to reach Mains.

Paper I · Merit for cut-off

General Studies (GS I)

200 marks · 100 MCQs · 2 hours · AM shift

Practice topic MCQs in Shelf →

Your GS-I net score decides the Prelims cut-off. Penalty −0.66 per wrong answer (1/3rd).

Current Events

National and international affairs — politics, economy, summits, schemes, geopolitics, and science breakthroughs.

History of India & National Movement

Ancient, Medieval, and Modern India with emphasis on socio-religious reforms and the freedom struggle (1857–1947).

Indian & World Geography

Physical, social, and economic geography; drainage, monsoon, resources, and industrial locations.

Indian Polity & Governance

Constitution, political system, Panchayati Raj, public policy, rights issues, and statutory bodies.

Economic & Social Development

Sustainable development, poverty, inclusion, demography, fiscal/monetary policy, inflation, and banking.

Environment, Ecology & Climate

Protected areas, IUCN species, Ramsar sites, UNFCCC, carbon markets, and pollution.

General Science

Space tech, defence systems, biotechnology, AI, nanotechnology, and everyday physics/chemistry.

Paper II · Strictly qualifying

CSAT (Aptitude Test)

200 marks · 80 MCQs · 2 hours · PM shift · pass ≥ 66

Practice CSAT-style sets →

Marks are NOT added to the Prelims cut-off. Penalty −0.83 per wrong answer. Decision-making items typically have no negative marking.

Reading Comprehension

Passages on environment, philosophy, technology, and economy with inference and assumption questions.

Interpersonal Skills

Communication and contextual logical understanding.

Logical Reasoning & Analytical Ability

Syllogisms, blood relations, seating, directions, family trees, and critical puzzles.

Decision Making & Problem Solving

Situational administrative choices (often no negative marks).

General Mental Ability

Coding-decoding, series, analogies, and visual pattern reasoning.

Basic Numeracy (Class X)

Number systems, percentages, ratios, averages, TSD, work-time, permutations, probability.

Data Interpretation (Class X)

Tables, charts, graphs, pie diagrams, and data sufficiency.

Data intelligence

Prelims subject-wise marks weightage (indicative)

Based on multi-year trends: Environment, Polity, and Economy typically form the GS-I backbone. Use as planning guidance, not a guarantee.

Subject domainAvg questionsEst. marksPriority
Environment, Ecology, Biodiversity & Climate16 – 2232 – 44Very High
Indian Polity, Constitution & Governance14 – 1828 – 36High
Indian Economy & Social Development15 – 2030 – 40High
History of India & Art / Culture13 – 1626 – 32High
Science & Technology10 – 1420 – 28High
Current Affairs & International Summits12 – 1624 – 32High
Geography (Physical, Indian & World)10 – 1420 – 28Medium
Stage 2 of 3

Mains scheme 2027 · 9 papers · 1,750 merit marks

PaperSubjectMarksDurationStatus
Paper ACompulsory Indian Language (8th Schedule)3003 hrsQualifying · 25% (75)
Paper BEnglish (Comprehension & Précis)3003 hrsQualifying · 25% (75)
Paper IEssay (Section A + Section B)2503 hrsMerit
Paper IIGS I — Heritage, History, Society & Geography2503 hrsMerit
Paper IIIGS II — Governance, Constitution, Polity, SJ & IR2503 hrsMerit
Paper IVGS III — Economy, S&T, Environment, Security & DM2503 hrsMerit
Paper VGS IV — Ethics, Integrity, Aptitude & Case Studies2503 hrsMerit
Paper VIOptional Subject — Paper 12503 hrsMerit
Paper VIIOptional Subject — Paper 22503 hrsMerit

Written merit total 1,750. Final rank = 1,750 + Interview 275 = 2,025. Language papers require 25% (75/300). Each merit paper needs ≥ 10% (25/250).

Paper A · Compulsory Indian languages (8th Schedule)

Choose any one · 300 marks · qualifying at 75.

AssameseBengaliBodoDogriGujaratiHindiKannadaKashmiriKonkaniMaithiliMalayalamManipuriMarathiNepaliOdiaPunjabiSanskritSanthaliSindhiTamilTeluguUrdu
Paper II · 250 merit marks

GS I — Heritage, History, Society & Geography

250 marks · ~20 questions · 10m & 15m · 3 hours

Open Mains blueprint →

Counted for merit. Sectional minimum 10% (25/250).

Indian Heritage & Culture

Art forms, literature, architecture; classical dance; Nagara/Dravida/Vesara; Bhakti–Sufi; Buddhist/Jain art.

Modern Indian History & Freedom Struggle

Mid-18th century to 1947; 1857; Swadeshi to Quit India; reformers; revolutionaries; INA.

Post-Independence & World History

Princely integration, linguistic states, land reforms; Industrial Revolution, World Wars, Cold War, decolonisation.

Indian Society

Diversity, women, population, poverty, urbanisation, globalisation, communalism, regionalism, secularism.

Physical & Human Geography

Geomorphology, climatology (monsoon, El Niño), oceanography, resources, industrial location factors.

Paper III · 250 merit marks

GS II — Governance, Constitution, Polity, Social Justice & IR

250 marks · ~20 questions · 10m & 15m · 3 hours

Open Mains blueprint →

Counted for merit. Sectional minimum 10% (25/250).

Indian Constitution & Political System

Evolution, features, amendments, Basic Structure; comparison with other democracies.

Federalism & Separation of Powers

Union–State functions, local bodies (73rd/74th), dispute redressal.

Parliament, Legislatures & Executive

Conduct of business, privileges, anti-defection, ministries, pressure groups.

Statutory Bodies & RPA

EC, CAG, UPSC, Finance Commission, NITI Aayog, NHRC, NGT, tribunals; Representation of People Act.

Governance & Social Justice

Welfare schemes, health, education, poverty/hunger, e-governance, Citizen’s Charters, NGOs/SHGs.

International Relations

Neighbourhood, Quad/BRICS/SCO/G20, diaspora, UN/WTO/IMF/World Bank.

Paper IV · 250 merit marks

GS III — Economy, Agri, S&T, Environment, Security & DM

250 marks · ~20 questions · 10m & 15m · 3 hours

Open Mains blueprint →

Counted for merit. Sectional minimum 10% (25/250).

Indian Economy & Planning

Growth, employment, inclusive growth, budgeting, resource mobilisation.

Agriculture & Food Security

Cropping patterns, irrigation, MSP, PDS, buffer stocks, food processing, animal rearing.

Infrastructure & Investment Models

Energy (incl. green hydrogen), ports, roads, airports, railways, PPP models.

Science & Technology

Everyday applications, Indian achievements, IT/space/robotics/nano/biotech, IPR.

Environment & Disaster Management

Conservation, pollution, EIA, NDMA, disaster-resilient infrastructure.

Internal Security

Extremism linkages, cyber security, money laundering, borders, organised crime–terror nexus, CAPFs.

Paper V · 250 merit marks

GS IV — Ethics, Integrity & Aptitude

250 marks · Section A theory + Section B case studies (~120–130M)

Open Mains blueprint →

Counted for merit. Case studies test dilemma resolution and constitutional morality.

Ethics & Human Interface

Essence, determinants, consequences; human values; role of family, society, education.

Attitude & Civil Service Values

Integrity, impartiality, objectivity, empathy, compassion toward weaker sections.

Emotional Intelligence & Thinkers

EI in administration; Western and Indian moral philosophers.

Probity in Governance

RTI, codes of ethics/conduct, Citizen’s Charters, work culture, corruption challenges.

Section B Case Studies

Real-world administrative dilemmas applying ethical frameworks.

500 high-yield marks

Optional subjects · Paper VI & VII

Select one subject · two papers · 250 each. Toppers often land ~285–310+ combined — see the cut-off studio.

Social sciences & humanities

Political Science & IR (PSIR)GeographySociologyHistoryPublic AdministrationAnthropologyPhilosophyPsychologyEconomicsLaw

Commerce & management

Commerce & AccountancyManagement

Pure & applied sciences

MathematicsPhysicsChemistryBotanyZoologyGeologyStatisticsAgricultureAnimal Husbandry & Veterinary ScienceMedical Science

Engineering

Civil EngineeringElectrical EngineeringMechanical Engineering

Literature (incl. English)

AssameseBengaliBodoDogriGujaratiHindiKannadaKashmiriKonkaniMaithiliMalayalamManipuriMarathiNepaliOdiaPunjabiSanskritSanthaliSindhiTamilTeluguUrduEnglish
Stage 3 of 3

Personality Test · 275 marks · Dholpur House

A board reviews your DAF and assesses suitability for public administration — not a re-test of textbook knowledge already covered in Mains.

Mental calibre

Alertness, assimilation, clear exposition, depth of interest.

Balance of judgment

Judgment on complex issues, variety of interests, constructive stance.

Integrity & leadership

Leadership, social cohesion, intellectual and moral integrity.

Resource guide

Orientation booklist

Illustrative one-book-per-area starting points — not endorsements. Prefer primary sources and your coaching material; revise with PYQs.

Paper / subjectStandard sources
GS 1 (History & Culture)NCERT Class 11 Art, Nitin Singhania (selective), Spectrum Modern India, Bipin Chandra (selective)
GS 1 (Geography)NCERT Class 11–12 Geography, GC Leong, Oxford / Orient BlackSwan Atlas
GS 1 (Society)NCERT Class 12 Indian Society & Social Change; current issues
GS 2 (Polity & Governance)M. Laxmikanth, DD Basu (selective), 2nd ARC reports, PRS briefs
GS 2 (International Relations)MEA releases, quality editorials, ORF / IDSA briefs
GS 3 (Economy & Agriculture)Economic Survey, Union Budget, standard economy text, NITI notes
GS 3 (Environment & S&T)Shankar / PMF IAS Environment, MoEFCC notes, Science Reporter, ISRO/DRDO
GS 4 (Ethics)Lexicon / Subba Rao, 2nd ARC Ethics in Governance, case practice
Aspirant clarifications

Syllabus FAQs

Has the UPSC CSE syllabus changed for 2027?

No structural change to the 3-stage scheme is expected: Prelims (GS + CSAT), Mains (9 papers), Interview (275). Dynamic depth in current affairs, S&T, environment, and ethics cases continues to rise.

Are CSAT marks counted for the Prelims merit list?

No. CSAT is qualifying at 33% (66/200). Prelims qualification for Mains depends on GS Paper I after clearing CSAT.

What is the total marks for final ranking?

2,025 marks = 1,750 (seven Mains merit papers) + 275 (Interview). Prelims and language qualifying papers are not added to the final total.

How many optional papers are there?

One optional subject with two papers (VI & VII), 250 marks each — 500 marks total, a large share of written merit.

Map this syllabus into Shelf

Browse Learn curriculum, practice from your notes, and plan revision against Prelims / Mains dates.

Disclaimer: UPSC Shelf is an independent study workspace and is not affiliated with, endorsed by, or connected to the Union Public Service Commission. Official notifications, calendars, admit cards, and results are published only at upsc.gov.in.