UPSC

Dear aspirant, Glad to meet you. Yes offcourse you can appear for UPSC. Minimum qualification for UPSC exam: The candidate must hold a degree from Government recognised Universities or possess an equivalent qualification. Candidates who are in their final year or awaiting results are also eligible to appear for UPSC preliminary Examination. Some Important Points to be noted
The subject covers the substantial syllabus of UPSC exam as a whole as the syllabus of optional paper of law has to reference in other General Studies papers too. (BA/LLB) covers Constitutional Law & Administrative law in the first section and International law in the second section. Whereas the General studies paper II covers Governance, Constitution, Polity, Social Justice, International Relations. ( Both are same). Hence substantial part of General Studies Paper II is covered in the optional paper I of Law. Hope it helps. If you found it useful then upvote or thumbs up my answer. Good luck.

Dear aspirant, the best B.A. The subject is that which has a link or some syllabus common to the general studies papers. These types of subjects are - History, Geography, Economics, Political Science
By opting for these types of subjects for the optional some syllabus of general studies paper get prepared itself. With the optional paper preparation. These subjects are also useful in the preliminary exam. This type of strategy will save a lot of time during preparation. It is a good & smart approach to the exam. You can pick from the following five:
Geography
Political Science
Economics
Modern History
Sociology
You can also take any literature, philosophy, or psychology to expand your mental horizon. The beauty of Humanities lies in its expansion. So keep up the hard work and enjoy your academics. Hope it helps.