UPSC

It is all up to your interest that what you want to choose and the scope for the same in future, because ultimately you need to check that and study as well so choose wisely. All the best.

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. Best of luck. Be committed and focused for the exam.

Yes, you are eligible for UPSC, you need to really focus and pass the exam and interviews.

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.