B.A

Hello Simran,
MA in my opinion would be the best course after BA. However, there are plenty of courses related to eco culminating in certificate or Diploma. You can attempt one of these.

If your aim is to join civil services, then B.A. will be best for you. You will get the UG degree in a short span of 3 years, and then you can appear for the exam. Going for an engineering degree is not suggested, because it will take 4 years and in most cases a year of drop after class 12th is required. Just join Government College, it is better to go for any 3 year UG course and prepare for UPSC with full power. I will suggest you to go for B.A. .

Yes, you are eligible for BA in Political Science.

The fees would vary from 10-18 thousand per year you can confirm the exact amount from the college.
Hope this helps.

You can check it on their website. For any course having an entrance examination, the result is declared on their website only and no email is sent. Though, you will get a call letter through post.

First of all visit:
http://www.bhu.ac.in/
and download syllabus of B.A. Entrance and previous year paper go through it and study your class 11 And 12th books of history geo civics and other languages, etc. Also prepared general knowledge for this you can consult Luscent or read newspaper daily. You can consult any entrance guide e.g. Arihant Publication
All the best.

Bachelors degree in relevant specialization is
eligibility for MA in Bengali in Vidya Sagar, so you are eligible for the same.