UPSC

UPSC or the Civil Services are the exams that need excellent General Awareness and Political Science/Public Administration knowledge. You can study Political Science Hon. If you plan to work hard even if you take Political Science as a subject in BA (Not Hons) with Economics or Geography or History, even that is better.

You should go for the arts stream, as it will give you more time to prepare for UPSC Civil Services. And, it will also enhance your knowledge in Social Science subject.

Yes, you are eligible for UPSC.

No, for UPSC, economics is not compulsory.

Dear Rashi,
As you are determinate to success in UPSC exam, go for the graduation as per your interest subject. For cracking UPSC exam in easier way, BA Public Administration, B.A. History and cultural studies courses are very helpful.
All the best for your future.

Please refer to the related question and answer links below for information:
https://ask.shiksha.com/how-should-i-prepare-for-ias-exam-after-class-12th-from-science-qna-3978319
https://ask.shiksha.com/what-is-the-ideal-strategy-to-prepare-for-upsc-ias-exam-qna-3843827
https://ask.shiksha.com/how-can-i-start-a-good-preparation-for-upsc-ips-exam-after-completing-12th-qna-3992004.

Hi,
Pune is better than Hyderabad & Visakhapatnam for UPSC coaching, because the two cities weren't good in providing the peak level teaching to UPSC.

Probably no as you need to have a AICTE approved degree.