Every candidate sitting the CSS exam under the Federal Public Service Commission (FPSC) writes the same six compulsory papers — there's no choice involved, unlike the optional side of the exam. This guide maps how the six fit together, what each one tests, and how the compulsory block differs from optional-subject selection.
Marks Distribution and Structure
The full written examination runs to 1,200 marks across 12 papers, split evenly: 600 marks compulsory and 600 marks optional. Each of the six compulsory papers is worth 100 marks, sat as a three-hour paper, so a candidate spends eighteen hours in the exam hall on compulsory subjects alone before ever touching an optional choice.
This applies to all candidates regardless of academic background — an engineering graduate and a literature graduate answer the exact same six papers. That uniformity is the point: FPSC uses the compulsory block to test a common baseline (language, general knowledge, current affairs, ethics) before the optional subjects test depth in a chosen field.
The Six Compulsory Subjects
The six papers are English Essay, English Precis and Composition, General Science & Ability, Current Affairs, Pakistan Affairs, and Islamic Studies — with Comparative Study of Major Religions sat in its place by non-Muslim candidates. Each already has its own dedicated syllabus breakdown on this site; this page is the map of how they fit together, not a repeat of each one's full topic list.
What Each Compulsory Paper Actually Tests
The six papers don't test the same skill twice. English Essay asks for formal essays on socio-political, economic, and philosophical subjects, marked on clarity, coherence, vocabulary, and argumentation. Precis and Composition instead tests précis composition, reading comprehension, grammar, translation, and idiomatic expressions — compression and accuracy rather than original argument.
General Science & Ability covers fundamental science concepts, everyday science applications, mental aptitude, and mathematical principles, while Current Affairs pulls from international developments, economic matters, environmental concerns, technology, and organizational frameworks — this paper is graded on how current your reading is, not textbook recall. Islamic Studies draws on Quranic studies, Hadith, jurisprudence, and Islamic history, and its Comparative Religion alternative shifts the same paper toward ethical philosophy instead.
Compulsory vs Optional Subjects
Where the compulsory block gives zero choice, the remaining 600 marks come from optional subjects, chosen across seven groups — a mix of a single 200-mark subject, or one or two 100-mark subjects, depending on the group. That flexibility is exactly what makes subject selection feel harder than the compulsory block. If you're weighing that decision, see the CSS optional subject groups explainer and the guide to choosing optional subjects — the compulsory subjects, by contrast, need no such strategy, only consistent preparation across all six.
Passing Criteria and Preparation Strategy
FPSC requires a minimum 40% on every individual compulsory paper, 33% on every optional paper, plus a 50% aggregate across the written portion to advance toward the interview, which itself carries 300 marks. Because compulsory papers can't be dropped or substituted, a single weak paper — English Essay is the most common culprit — can undo strong optional-subject scores elsewhere.
A practical prep order: start with English Essay and Precis early since writing skill compounds slowly, run Current Affairs and Pakistan Affairs as ongoing reading rather than a final cram, and treat Islamic Studies and General Science as the two papers that reward structured revision closest to the exam. Always cross-check subject names and mark distributions against the latest official FPSC notification before finalizing a study plan. You can also download the full CSS syllabus for the complete compulsory-and-optional breakdown in one place.
Continue your CSS preparation
Frequently asked questions about CSS compulsory subjects
There are six compulsory subjects in the CSS exam: English Essay, English Precis and Composition, General Science & Ability, Current Affairs, Pakistan Affairs, and Islamic Studies (or Comparative Study of Major Religions for non-Muslim candidates).
The six compulsory subjects carry 600 marks combined, each paper worth 100 marks, out of the CSS exam's total of 1,200 written marks across 12 papers.
No. Every candidate must attempt all six compulsory papers exactly as assigned, with the single exception that non-Muslim candidates sit Comparative Study of Major Religions instead of Islamic Studies.
Non-Muslim candidates sit Comparative Study of Major Religions in place of Islamic Studies, still worth the same 100 marks.
Yes. Unlike optional subjects, the six compulsory papers apply uniformly to every candidate regardless of academic background or chosen optional group.
Compulsory papers require a minimum of 40% each to pass individually, optional papers require 33% each, and candidates also need a 50% aggregate across the written portion to qualify for the interview stage.
Each compulsory paper is a three-hour written paper worth 100 marks, the same format used across all 12 CSS papers.
English Essay is the most commonly cited weak point, since it's graded on argument quality and command of language rather than factual recall, which is harder to cram close to the exam than a subject like Current Affairs.
Some do in substance — Current Affairs and Pakistan Affairs share ground with optional subjects like International Relations or Political Science — but each is examined and marked as a fully separate 100-mark paper.
This site has a dedicated breakdown for each: English Essay, English Precis and Composition, General Science & Ability, Current Affairs, Pakistan Affairs, and Islamic Studies, linked from the sections above.
The six compulsory subjects and their 600-mark total have stayed consistent in recent cycles; always verify the current year's official FPSC notification before finalizing preparation, since topic emphasis within a paper can shift even when the subject list doesn't.