Government & Defence Entrance Exam

Sorry, now, it won't be possible.

Yes, you are eligible for UPSC.

No, for UPSC, economics is not compulsory.

For becoming an IAS you should apply for Bachelor of arts (BA) with subjects like history, geography, political Science and economics. Because these are those subjects from which questions are asked in IAS exam so after you study them in your graduation, then you do not have to study it for UPSC.

Yes, you can apply for Navy after the completion of your 10th class also.

Primary syllabus includes of maths, physics and chemistry of Andhra Pradesh state board.

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.

If you think you can work hard, then you should. If not, then go for a local college.