The optional subjects cover almost all the courses taught at the college and university level. However, new candidates may generally select any subject randomly, which leads to low scores. There are some important points to consider while selecting optional subjects to choose the best subjects for getting a high score.

1. The CSS exam has 12 papers, including 6 compulsory and 6 optional papers. Each paper carries 100 marks. The CSS exam has 1,200 marks in total.
2. The compulsory subjects are as follows: 1) Essay, 2) English (Precis and Composition), 3) General Science & Ability, 4) Current Affairs 5) Pakistan Affairs and 6) Islamic Studies or Comparative Study of Major Religions (for non-Muslims)
3. For optional subjects, candidates have to choose from the given 7 groups of subjects. Within these groups, the subjects carry either 100 marks each or 200 marks each. Subjects carrying 100 marks have two papers, whereas subjects carrying 200 marks also have two papers. The group of groups along with the rules for their selection are provided at the end.

1. Never just tick mark subjects from the provided groups of subjects without planning. Review all the provided groups of subjects several times to choose the best ones.
2. Each subject has its detailed syllabus, reflecting which areas (e.g., topics) are included, how much subject matter is included, and how much time is required for preparation.
3. It is better to choose those subjects which you have already studied in your Bachelor or Intermediate program. Since you have already studied them, you will have more command over them. You will be more familiar with them, and it will be much easier to prepare them.
4. Since you have to select a number of subjects, all of these may not cover the subjects you have studied in your previous academic programs. Now, you have to look for four factors: 1) subjects that you are generally more interested in, 2) subjects that are connected to other chosen subjects or that may help you in preparing for optional or compulsory subjects, 3) subjects that are relatively easier to prepare, and 4) subject generally perceived as high-scoring subjects.
5. Select those subjects which interest you more: Selecting subjects of your interest will make it easier for you to prepare them. Having an interest in an area also indicates your greater familiarity with and understanding of the subject.
6. Subjects that may help in other subjects: For instance, the subject of Sociology may help you in preparing for the Essay paper (a compulsory subject) because the Essay paper generally includes writing an essay on a social issue, an area broadly covered by the subject of Sociology. Likewise, the subject of Political Science may help you with the subject of Current Affairs (a compulsory subject). Similarly, many other courses are connected and help in preparation for each other.
7. Subjects that are easy to prepare: Subjects easy to prepare means you have gone through their syllabi and reached a decision that the topics are easy to understand based on your previous knowledge as well as considering the available time.
8. If you are good at your regional language, such as Punjabi, Sindhi, Pashto, or Balochi, it is better to select it as one of your optional subjects. These are generally perceived as good-scoring subjects. However, you should not select them only due to your familiarity with them as your mother tongue if you are not originally good at them academically. These courses have their standard grammar and rules for formal writing. You should have a good command of their grammatical rules and possess a sophisticated vocabulary in these regional languages in order to write your answers in a formal tone in the exam. Though they are generally viewed as good-scoring subjects, your decision should consider all the aforementioned factors.
9. If you have studied a science subject in your previous classes and you believe that you are very good at it, you should select it as an optional subject.
10. Remember, appearing in the CSS exam requires a lot of preparation and time resources. It means you need to be thoughtful from the very beginning—that is, choosing the right subjects in order not to waste your time, energy, and other resources. Never select subjects randomly or just by chance. Give it proper time. Review the groups of subjects, study their syllabi, consider the interest and familiarity factors, and discuss with other candidates and your teachers to make a wise decision regarding selecting each subject.

Group-I: (One subject of 200 marks can be selected only)

Code No.	Subjects	Marks
11.	Accountancy & Auditing	200
12.	Economics	200
13.	Computer Science	200
14.	Political Science	200
15.	International Relations	200

Group-II: (Either one subject of 200 marks from code 16-17 or two subjects of 100 marks each from code 18-21can be selected only)

Code No.	Subjects	Marks
16.	Physics	200
17.	Chemistry	200
18.	Applied Mathematics	100
19.	Pure Mathematics	100
20.	Statistics	100
21.	Geology	100

Group-III: (One subject of 100 marks can be selected only)

Code No.	Subjects	Marks
22.	Business Administration	100
23.	Public Administration	100
24.	Governance & Public Policies	100
25.	Town Planning & Urban Management	100

Group-IV: (One subject of 100 marks can be selected only)

Code No.	Subjects	Marks
26.	History of Pakistan & India	100
27.	Islamic History & Culture	100
28.	British History	100
29.	European History	100
30.	History of USA	100

Group-V: (One subject of 100 marks can be selected only)

Code No.	Subjects	Marks
31.	Gender Studies	100
32.	Environmental Sciences	100
33.	Agriculture & Forestry	100
34.	Botany	100
35.	Zoology	100
36.	English Literature	100
37.	Urdu Literature	100

Group-VI: (One subject of 100 marks can be selected only)

Code No.	Subjects	Marks
38.	Law	100
39.	Constitutional Law	100
40.	International Law	100
41.	Muslim Law & Jurisprudence	100
42.	Mercantile Law	100
43.	Criminology	100
44.	Philosophy	100

Group-VII: (One subject of 100 marks can be selected only)

Code No.	Subjects	Marks
45.	Journalism & Mass Communication	100
46.	Psychology	100
47.	Geography	100
48.	Sociology	100
49.	Anthropology	100
50.	Punjabi	100
51.	Sindhi	100
52.	Pashto	100
53.	Balochi	100
54.	Persian	100
55.	Arabic	100