hi Genius,
subjects selection is very tough task in initial stage.your combination is sort of unpredictable though, every optional is unpredictable but,
scoring trend in css matters a lot.
select your subjects according to your interest, educational background and scoring trend.
political science is not very scoring and international relations also.
yeah, public administration is scoring but boring.
i did masters in pol science but didn't opt because it is low scoring.
per my experience in css forum,
Psychology, Islamic history,Geography,Public Administration,international Law,journalism, Sociology and regional languages are in and scoring subjeccts.
you can opt optional of 600 into this list.
final decision is yours.
stay happy:)