Hello Aditya, For UPSC the subject needs to be strong are - History, Geography, Polity, Environmental and Science, Art and culture, Economics and current affair... because these subjects are in both prelims and Mains...
Other then this UPSC also has 9 Mains paper among which has one optional paper consisting of 2 parts (1 & 2) 500 marks, and candidate can choose any optional either from Arts subject/ commerce subject or else subject (As mentioned By UPSC)
Now come to your question, Arts contains subjects like economics, history, polity etc, whereas commerce has subjects related to accountancy and finance... and there is no compulsion, u can give paper with any field. SO, now i think things must be getting clear inorder to make career choice,,,,
Best of luck
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