Most of what the Civil Services Examination asks was true ten years ago and will be true ten years from now. The Constitution’s design, the monsoon’s mechanics, the arithmetic of national income — this is the static core, and it carries the bulk of the 100-question, 200-mark General Studies paper that decides Prelims. This section holds that core, split into the six subjects the syllabus itself names.
Each subject page is study material first and trivia never: the facts the exam has actually asked, organized to be revised in weeks, not months.
The six subjects
Where each subject sits in the exam
Every subject here appears twice: once as objective questions in the Prelims General Studies paper, and again as written answers in a Mains General Studies paper. The map below is worth internalizing before the first page of notes — it tells you what each subject must eventually be able to do.
| Subject | In Prelims (GS Paper I) | Home in Mains |
|---|---|---|
| History | History of India & the Indian National Movement | GS Paper I — heritage, culture & modern history |
| Geography | Indian & World Geography | GS Paper I — physical, social & economic geography |
| Polity | Indian Polity & Governance | GS Paper II — Constitution, polity & governance |
| Economy | Economic & Social Development | GS Paper III — economy, planning & inclusion |
| Environment | Environmental Ecology, Biodiversity & Climate Change | GS Paper III — environment & disaster management |
| Science & Technology | General Science | GS Paper III — science, technology & innovation |
How to work this section
Read a subject page the way you would read for the exam, not the way you would read a book: pen in hand, closing each topic by attempting its questions. The material here is deliberately compressed — if a fact appears, the exam has cared about it or its neighbors.
Then test the reading. The past papers hold what UPSC has actually asked, year by year, and they are the only honest examiner of whether a subject is finished. Reading feels like progress; scoring is progress.
GK — common questions
Are NCERT textbooks enough for these subjects?
They are the right floor and the wrong ceiling. The NCERTs build the vocabulary every UPSC question assumes — read them first, and read them fast. The exam layer sits above them: one standard reference per subject, worked against past-paper questions until the way the Commission frames that subject feels familiar.
The subject pages in this section are built for that second layer — compressed enough to revise, complete enough to answer from.
How is GK different from Current Affairs on this site?
GK is the syllabus line; current affairs is the news line. Everything here is static — the structure of the Constitution, the mechanics of the monsoon, the sequence of the national movement — and stays true from one cycle to the next. What changed this year lives in Current Affairs, month by month. The two meet constantly in the exam hall, so read them as one preparation, not two.
Do Prelims and Mains need separate notes for the same subject?
Same material, different output. Prelims tests recognition — a statement is right or it is wrong. Mains tests construction — an argument assembled in twenty minutes of writing. Notes that serve both are organized by topic, not by paper: facts and dates on one layer, issues and examples on the next. Writing two parallel sets of notes doubles the work and halves the revision.
In what order should the six subjects be studied?
UPSC prescribes no order, and toppers disagree — which tells you the order matters less than the finishing. A common, workable sequence pairs a heavy subject with a lighter one, Polity with Environment, History with Science & Technology, so a day of reading has two textures. What decides outcomes is closing loops: a subject read once and never revised scores like a subject never read.
When is a subject actually done?
When its past-paper questions fall cold — attempted under time, without notes, at a hit rate you would accept in the exam hall. Reading has no natural endpoint; questions do. Work the past papers for the subject, and let the score, not the page count, tell you where you stand.
