The UPSC syllabus for Civil Services Examination covers Prelims, Mains written papers, optional subject papers, and the Interview/Personality Test. For 2026, use the official UPSC Civil Services Examination notice as the controlling source: Prelims has two objective papers, Mains has nine written papers, and final merit is based on 1750 written marks plus 275 interview marks.
The UPSC exam syllabus is best read in two layers. First, know the exam stage: Prelims, Mains written examination, and Interview/Personality Test. Second, break the syllabus by subject: General Studies, CSAT, Essay, language papers, and one optional subject.
Officially, UPSC describes the Civil Services Examination as having two successive stages: Civil Services Preliminary Examination and Civil Services Main Examination, where the Main Examination includes the written examination and the Interview/Personality Test. For study planning, students often call these three working stages: Prelims, Mains, and Interview. This article uses both terms carefully so that your plan matches the official notice.
Before using any coaching notes, keep the official syllabus PDF open. Notes can help, but the official document decides what is inside the course and what is outside it. Exact dates, vacancies, centres, and application rules can change, so verify those on the official UPSC notice before relying on them.
Compare Optional Subjects: A Detailed Breakdown
The optional subject is the part of the UPSC mains syllabus where one choice creates two papers of 250 marks each. That means the optional contributes 500 marks to the written merit total of 1750 marks.
There is no single optional subject that is right for every candidate. A useful comparison should not ask only “Which optional is popular?” It should ask whether you can read the subject for months, write answers in the required style, and revise the syllabus without losing time from General Studies.
| Comparison factor | What to check before choosing | Why it matters |
|---|---|---|
| Academic background | Have you studied the subject at college level or close to it? | A familiar subject reduces the time needed to understand basic terms. |
| Syllabus size | Can you list the major units and subtopics on two pages? | A subject that feels manageable is easier to revise before Mains. |
| Overlap with GS | Does it overlap with history, polity, geography, society, ethics, economy, environment, or science? | Overlap can save time, but it should not be the only reason to select the subject. |
| Answer style | Does the subject need diagrams, maps, case laws, theories, numerical work, or thinkers? | Your writing method must fit the subject; the same answer style does not work everywhere. |
| Resources | Can you access standard books, previous papers, and a reliable syllabus checklist? | Material gaps slow revision and answer practice. |
| Interest over time | Can you study it even when preparation becomes repetitive? | Optional preparation is long; weak interest often shows during revision. |
Direct optional-subject comparison method
Use this five-step comparison before locking your optional subject. This is the direct comparison feature many students need but do not build for themselves.
- Shortlist three subjects. Choose them from the official list only. Do not include a subject simply because someone else selected it.
- Print or save the syllabus of each subject. Mark topics as known, partly known, or new.
- Read one previous question paper for each. Do not solve it yet. Just check whether the questions feel understandable after reading the syllabus headings.
- Write one 150-word answer from each subject. This exposes whether you can explain the subject in exam language.
- Score each subject out of 5 on four factors: interest, background, resource access, and revision comfort. The subject with the highest total is not automatically final, but it becomes the strongest candidate.
For example, suppose a candidate compares Geography, Sociology, and Mathematics:
| Subject | Interest | Background | Resources | Revision comfort | Total |
|---|---|---|---|---|---|
| Geography | 4 | 3 | 4 | 3 | 14/20 |
| Sociology | 3 | 2 | 4 | 4 | 13/20 |
| Mathematics | 4 | 5 | 3 | 2 | 14/20 |
Here, Geography and Mathematics tie at 14. The next step is not to follow a rank list. The candidate should write one answer from each subject and check which one can be improved faster. If Mathematics revision feels slow because of problem-solving load, Geography may be the safer choice for that candidate. If the candidate has strong college-level Mathematics and can maintain practice, Mathematics may still be suitable.
Official list of optional subjects
The UPSC optional syllabus includes Agriculture, Animal Husbandry and Veterinary Science, Anthropology, Botany, Chemistry, Civil Engineering, Commerce and Accountancy, Economics, Electrical Engineering, Geography, Geology, History, Law, Management, Mathematics, Mechanical Engineering, Medical Science, Philosophy, Physics, Political Science and International Relations, Psychology, Public Administration, Sociology, Statistics, and Zoology.
UPSC also allows Literature of one of the listed languages: Assamese, Bengali, Bodo, Dogri, Gujarati, Hindi, Kannada, Kashmiri, Konkani, Maithili, Malayalam, Manipuri, Marathi, Nepali, Odia, Punjabi, Sanskrit, Santhali, Sindhi, Tamil, Telugu, Urdu, and English.
A common mistake is choosing an optional only because it overlaps with General Studies. Overlap helps only when you can still write subject-specific answers. Optional papers are not GS papers with a different name.
UPSC Syllabus by Subject: Filter & Focus
The UPSC syllabus can look too wide if you read it as one long list. A better way is to filter it by subject group: Prelims General Studies, CSAT, Mains Essay, Mains General Studies, qualifying language papers, and optional subject.
UPSC prelims syllabus: General Studies Paper I
General Studies Paper I is the main screening paper in Prelims. It carries 200 marks and is objective type. Its marks decide the Prelims cut-off, subject to the candidate qualifying CSAT.
| Area | Official scope in plain language | How to focus |
|---|---|---|
| Current events | National and international events | Connect news with polity, economy, science, environment, and international relations. |
| History | History of India and Indian National Movement | Separate ancient, medieval, modern, and freedom movement themes. |
| Geography | Physical, social, and economic geography of India and the world | Use maps and link physical geography with climate, resources, and population. |
| Polity and governance | Constitution, political system, Panchayati Raj, public policy, rights issues | Read constitutional articles with institutions and current governance examples. |
| Economy and social development | Sustainable development, poverty, inclusion, demographics, social sector initiatives | Understand terms, schemes, indicators, and basic economic reasoning. |
| Environment | Ecology, biodiversity, and climate change without subject specialization | Study concepts, protected areas, conventions, and environment-current affairs links. |
| General science | General science | Focus on basic science and its application in health, technology, environment, and daily life. |
UPSC CSAT syllabus: General Studies Paper II
The UPSC CSAT syllabus is part of Prelims Paper II. It is qualifying in nature with minimum qualifying marks fixed at 33%. Since the paper is 200 marks, the working is:
Minimum qualifying marks = 33% of 200 = 33/100 × 200 = 66 marks.
CSAT covers comprehension, interpersonal skills including communication skills, logical reasoning, analytical ability, decision-making, problem-solving, general mental ability, basic numeracy of Class X level, and data interpretation of Class X level.
Do not ignore CSAT because it is qualifying. A candidate who does not secure the required qualifying marks in Paper II cannot clear Prelims, even if Paper I performance is strong. It is also mandatory to appear in both Prelims papers for evaluation.
UPSC GS syllabus for Mains
The UPSC GS syllabus in Mains is divided into four papers of 250 marks each. These papers test explanation, analysis, examples, and balanced judgement. The four GS papers are counted for merit.
| Mains GS paper | Marks | Main subject area |
|---|---|---|
| General Studies I | 250 | Indian heritage and culture, history, geography of the world and society |
| General Studies II | 250 | Governance, Constitution, polity, social justice, and international relations |
| General Studies III | 250 | Technology, economic development, biodiversity, environment, security, and disaster management |
| General Studies IV | 250 | Ethics, integrity, and aptitude |
The Mains GS papers should not be prepared like Prelims. In Prelims, recognition and elimination matter. In Mains, the answer must address the command word, use relevant facts, and finish within the word and time limits.
Essay syllabus
Essay is Paper I in the merit-counting written papers and carries 250 marks. UPSC states that candidates may be required to write essays on multiple topics and are expected to keep closely to the subject, arrange ideas in an orderly manner, and write concisely.
The mistake students make is treating Essay as a general opinion paper. It is better prepared through themes: governance, society, ethics, science and technology, economy, environment, democracy, education, and human values. Each essay should have a clear argument, examples, and a conclusion that follows from the discussion.
Qualifying language papers
Mains has two qualifying papers of 300 marks each: Paper A, an Indian language selected from the languages included in the Eighth Schedule to the Constitution, and Paper B, English. These papers are qualifying in nature and their marks are not counted for ranking.
The qualifying standard matters because UPSC states that Essay, GS, and Optional papers are taken cognizance only for candidates who attain 25% marks in Indian Language and 25% in English as minimum qualifying standards. Working:
Minimum in each qualifying paper = 25% of 300 = 25/100 × 300 = 75 marks.
Paper A has exemptions for candidates from specified North-Eastern states and for eligible candidates in the Hearing Impairment sub-category where the official conditions are met. Candidates should read the current official notice for the exact exemption wording before relying on it.
UPSC optional syllabus
The UPSC optional syllabus is not one paper; it is two papers in the same optional subject. Paper VI is Optional Subject Paper 1 for 250 marks, and Paper VII is Optional Subject Paper 2 for 250 marks.
UPSC states that the scope of optional subject papers is broadly of honours degree level, higher than bachelor’s degree and lower than master’s degree. For Engineering, Medical Science, and Law, the level corresponds to bachelor’s degree. This is why a casual reading of optional topics is not enough.
UPSC Syllabus by Exam Stage: Prelims vs. Mains
The UPSC exam pattern and syllabus must be read together because the same broad topic can be tested in different ways. Polity in Prelims may ask a factual or conceptual MCQ. Polity in Mains may ask for explanation, comparison, criticism, or reform suggestions.
| Stage | Papers | Question type | Marks | Role in selection |
|---|---|---|---|---|
| Prelims | General Studies Paper I and General Studies Paper II | Objective type, multiple choice | 200 + 200 = 400 | Screening test for Mains; Paper II is qualifying at 33% |
| Mains written | 9 papers: 2 qualifying and 7 counted for merit | Conventional essay type | 1750 counted for merit; qualifying papers are 300 each | Tests depth, expression, analysis, and subject understanding |
| Interview/Personality Test | One personality test | Board interaction | 275 | Added to written merit for final ranking |
UPSC prelims syllabus: what matters most
The Preliminary Examination is a screening test comprising two objective-type multiple-choice papers. Both General Studies Paper I and Paper II in the Preliminary Examination carry a maximum of 200 marks each, so the total Prelims marks are 400.
General Studies Paper II, commonly called CSAT, is qualifying in nature. The required qualifying level is 33%, which equals 66 marks out of 200. The merit list for Mains qualification is drawn using Paper I marks after applying the Paper II qualifying condition.
There is negative marking in objective papers. For a wrong answer, one-third of the marks assigned to that question is deducted. If a question is left blank, there is no penalty. If more than one answer is marked, it is treated as wrong even if one marked option is correct.
UPSC mains syllabus: what changes after Prelims
The UPSC mains syllabus is written-answer based. The written examination has nine papers of conventional essay type. Two papers are qualifying: Indian Language and English. Seven papers count for merit: Essay, GS I, GS II, GS III, GS IV, Optional Paper 1, and Optional Paper 2.
The marks counted for written merit are:
- Essay: 250 marks
- General Studies I: 250 marks
- General Studies II: 250 marks
- General Studies III: 250 marks
- General Studies IV: 250 marks
- Optional Paper 1: 250 marks
- Optional Paper 2: 250 marks
Total Mains written marks counted for merit = 7 × 250 = 1750 marks.
Final total after Interview = 1750 + 275 = 2025 marks.
This calculation matters because it shows why the IAS syllabus cannot be prepared only through Prelims notes. Mains requires answer writing, examples, structure, and revision of optional subject papers.
Interview/Personality Test in the syllabus plan
The Interview/Personality Test does not have a subject-wise syllabus like Prelims or Mains. UPSC describes it as an assessment of personal suitability for a career in public service. It looks at qualities such as mental alertness, judgement, clear expression, social traits, interest in current affairs, and integrity.
Students should not treat the interview as a separate general knowledge test. The knowledge base has already been tested through written papers. The interview checks how the candidate thinks, responds, and connects issues with public service.
How to use the syllabus without getting lost
Use this simple weekly method:
- Map each topic to a paper. For example, environment appears in Prelims and GS III, but the question style changes.
- Keep one official syllabus checklist. Do not maintain five different lists from different sources.
- Tag current affairs by syllabus topic. A news item on climate finance belongs to environment, economy, and international relations.
- Practise Prelims and Mains differently. Use MCQs for Prelims and timed written answers for Mains.
- Review optional every week. Optional subject cannot be left until after Prelims if the candidate is serious about Mains readiness.
For dates, application windows, admit cards, and any change in rules, use the current official notice. You can also follow our page on UPSC notification and exam dates for a student-friendly reading of the official updates.