I will suggest you to make time table, give equal time to each subject. Find most leisure time for study besides saying this i'll suggest you to manage early morning time for study to focus more clearly. Timetable should contain one or two or three hours for for each subject (depends upon how much time do you have daily for study) further it should be organised in parts: reading (suggested or written by pakistani CSPs or subject professors) books, past papers solving activity, making notes & discussion(if possible).

I can share the lnks of books if you need.
Regards.