Colleges in West Bengal

For BA, you can pursue anything in class 12th. There is no subject eligibility criteria for BA. But, I would suggest pursuing science, as it could later help you to pursue many other courses. You can take English and Hindi Literature in class 12th if you want. That could help but not much.

Bankura University, Bhairab Ganguly College, Dinabandhu Andrews College, Garhbeta College, etc. are few colleges in West Bengal.

Yes, you are eligible for CAT Exam for admission in IIM-A and IIM Calcutta. To know more visit: https://www.shiksha.com/mba/exams/cat.

Maths in 12th is compulsory along with a total passing percentage of 50%+. This the the least eligibility for BCA.

In terms of career exposure, NMIMS being in Mumbai, has a lot of advantages. However the choice and decision is dependent on career aspirations, academic inclination and financial viability and affordability (given the high cost of living in Mumbai).

To know about the study centre, please visit the link given:
http://www.wbnsou.ac.in/study_centres/List_of_Study_Centres_for_BDP-PG-BLIS_for_Admission.shtml#sc_bdp_pg_blis

I think there is a slight confusion here. IISWBM & IIM are two seperate entities. For IISWBM, you need to get 60 percentile in order to secure your place plus your GD-PI performance matters.

I am afraid that is possible all the time.
I think the MSW courses are not available in Bengali.
You can look for the books in Bengali in the college.

Hello dear, Eligibility: Diploma in electrical from the approved technical board from AICTE. Age-18 to 28 years. Syllabus-1). There will be a computer-based test (CBT). Of objective type-multiple choice questions only. The syllabus of the examinations will be commensurate to essential qualification