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Since you have expressed interest to do UPSC, the best combination of subjects will be - Political Science, History, Sociology, English, Geography (there is a separate Geologists exam by the UPSC as well) and even Law.
So, you could choose any of the above subjects that you are good at and keep that as your base subject for UPSC. Another option is to opt for a B. A (Pass) course, wherein, you will study most of the subjects mentioned above. The only drawback here is that just in case you don't clear the UPSC, you will be left with a B.A (Pass) degree, instead of a B.A (Hons) degree. Many PG courses require an Honours degree at the UG level.