Hello student,
Its is quite natural to feel this kind of dilemma. Firstly UPSC requires a graduation degree in any discipline so you can choose any field based on your choice. But if you take into account the work profile of IAS or any administration job then BA political science would be helpful. Also BA will give your more time to focus on other activities.
So all the best for your studies
Here is the link to UPSC exam details
https://competition.careers360.com/articles/upsc-ias-exam-pattern
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