I want to know which are the best subjects to join foreign service of pakistan my combination is below i would also like some suggestions regarding my subject selection

International relations 200
International law 100
Indo pak history 100
Public administration 100
Journalism 100

Subject Combination has nothing to do with your allocation in desired group/ service. The marks & merit no contributes for your allocation. As a subject combination it is a good combination. Work hard for "International Relations".

These aren't cluster based exams, so subject combination doesn't matter.

Int Rel: with the vast majority opting for this paper now, you can be sure it'll be very tough and IR has always had a low scoring average, so prepare very well.

Int law: good pick, this is probably the best scoring paper of the Law subjects..and it overlaps with IR.

Indo-pak history: Among CSS candidates this used to be known as the "Graveyard paper" , back when it was 200 marks..it would be nothing short of a miracle to score 120+, maybe they make it more scoring now but you should rather opt for one of British, European or American history as some of its chapters overlap with IR.

Public admin: I don't know much about this so can't comment.

Journalism: good choice, if your english writing skills are good, you should be able to score well in this paper.

You should also have a look at opting for a regional subject paper, those have a limited course with regular high scores for e.g Pashto has an average score of 65+.