Hi Aspirant,
IFS is all about preserving diplomacy, drafting, handling and formulating foreign policy. You don't need to specialise in this, but if you want a degree with subjects like International Affairs, foreign policy will have an advantage. But this should be your preference.
I would like to recommend you to choose the subject(s) according to the optional subject(s) that you would vote for in the UPSC , or vice-versa because it will definitely help you to prepare more efficiently for that exam. Anyone can apply as a candidate from any stream. But you need to finish your degree to be eligible for the IFS exam.
Thank you
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