The document outlines the compulsory and optional subjects for CSS exams. The compulsory subjects include essay writing, English, general science, current affairs, and Pakistan affairs. For optional subjects, there are 7 groups from which candidates can choose subjects. Group 1 allows one 200-mark subject, Group 2 allows one 200-mark or two 100-mark subjects, and Groups 3 through 7 each allow one 100-mark subject from the list of options provided.