Half of the CSS written exam is your choice. Six papers are compulsory for everyone; the other 600 marks come from optional subjects you pick yourself, from seven groups. The choice is made once, on your application, and it shapes most of your preparation, so it is worth understanding the rules before you look at the subjects.
Everything below comes from FPSC's own scheme for the CSS Competitive Examination, which you can read subject by subject on our CSS written syllabus page.
Key takeaways
- The optional part is 600 marks: six papers of 100 marks, from seven groups.
- Group I allows one 200-mark subject; Group II one 200-mark subject or two 100-mark subjects; Groups III to VII one 100-mark subject each.
- Groups III to VII together give at most 500 marks, so every combination uses Group I, Group II, or both.
- Before you pick, read the full syllabus and a few years of past papers for each subject on your shortlist.
The written exam in one paragraph
The written exam is 12 papers of 100 marks each, 1,200 marks in all. Six are compulsory: English Essay, English (Précis and Composition), General Science & Ability, Current Affairs, Pakistan Affairs, and Islamic Studies (or Comparative Study of Major Religions for non-Muslim candidates). The other six are your optional papers. Every paper lasts three hours, and a 200-mark subject is examined in two papers of 100 marks each.
The seven groups and their rules
FPSC prints a rule above each group. The rules decide which combinations are possible.
Group II's rule reads oddly, so in plain terms: you can take 200 marks from Group II at most, either one 200-mark subject (Physics or Chemistry) or two of the 100-mark subjects.
The combinations that add up to 600
Groups III to VII allow one 100-mark subject each, so together they give at most 500 marks. To reach 600 you need Group I or Group II, and you can take both:
- Group I + Group II + two of Groups III to VII: 200 + 200 + 100 + 100.
- Group I + four of Groups III to VII: 200 + 400.
- Group II + four of Groups III to VII: 200 + 400, where the Group II 200 can be Physics, Chemistry, or two 100-mark subjects.
You cannot take two subjects from Group I, or two subjects from any one of Groups III to VII.
How to choose: five questions to ask
There is no subject that is easy for everyone. These questions help you find the ones that suit you:
- What did you study? A subject you studied at university starts you with the vocabulary and the reading habits it needs. That counts for more in a 3-hour written paper than in an MCQ test.
- Does it share ground with a compulsory paper? Some optional subjects overlap with the compulsory ones. International Relations and Current Affairs both cover Pakistan's foreign relations, for example, and History of Pakistan & India sits close to Pakistan Affairs. Shared ground means less separate reading.
- How long is the syllabus? Open the subject's page and look at the sections and topics. Two 100-mark subjects can be very different in length.
- What do the papers actually ask? Read three or four years of the subject's past papers. Some subjects ask the same kinds of questions every year; others range widely. Our guide on how to use CSS past papers shows a quick method.
- Can you write it in English for three hours? Every paper is answered in English unless the paper says otherwise. The language papers (Punjabi, Sindhi, Pashto, Balochi, Persian and Arabic) are answered in their own language.
Read before you decide
For each subject on your shortlist, spend an hour on two pages: its syllabus and its past papers. Every subject page on our CSS written syllabus shows FPSC's syllabus word for word and links that subject's papers from 2016 to 2026. Comparing three or four shortlisted subjects this way usually makes the choice clear.
Frequently asked questions
Yes. Group II plus four subjects from Groups III to VII also makes 600 marks. What you cannot do is skip both Group I and Group II, because Groups III to VII give at most 500 marks.
Only in Group II, and only as two 100-mark subjects (for example Applied Mathematics and Statistics). Every other group allows one subject.
Yes. Every optional paper except Pure Mathematics and Applied Mathematics opens with 20 MCQs, as FPSC's scheme states.
No. The MPT is the screening test before the written exam, and it covers English, General Knowledge, General Abilities, Islamic Studies and Urdu. See CSS MPT vs the written exam.