In my humble opinion you should change Islamic history with us history or with European history because both these subjects are overlapping topics with international relations. Overlapping topic are world war 1 And 2 and others. For support in international relations, you should opt geography because it is easy to understand and scoring subject. Don't opt public administration because huge syllabus and low scoring subject instead of public administration you may select any new subject like anthropology because international relations deals with studies of relationship of government of different counties while anthropology deals with culture and human of different countries and societies.

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