B.Com

As per my knowledge and experience, you have to qualify the entrance exam of JNU for B.Com.

General eligibility for M.A. Economics is as below:
B.A. (Hons) in Economics subject
A minimum aggregate score of 50% at the level of graduation. The eligibility criteria may differ from college to college where for some universities, admission procedure is entrance exam. For some it is Merit based. A

Four years of gap is not an issue in pursuing M.Com. You can do the M.Com course from distance mode also from IGNOU or other open universities. The eligibility criteria of IGNOU is Graduates in any discipline or equivalence from a recognised university. The course fee is about Rs. 11000/ and the cou

I would recommend you not to go for a BBA degree after B.Com. It doesn't seem to make a good point to do a double graduation. I would suggest you to rather go for a M.Com as it will get you a PG degree as well as good payscale. Click below
https://www.shiksha.com/accounting-commerce/colleges/m-com-c

I would recommend you to go for M.Com from a reputed college/university. Click below
https://www.shiksha.com/accounting-commerce/colleges/m-com-colleges-india.

You are definitely eligible for applying for B.Ed after completing B.Com and MCA course. For B.Ed, the minimum requirement is that you must be graduate. It does not matter from which course and which stream, and it will give you benefit of doing MCA. So, you need not to worry and can definitely appl

You can contact Bangalore University, because some university can migrate their student from one user to another university, and so it is not possible to say yes.

Kindly click the link below. This link will help you find more detailed information about college approvals.
https://kalingauniversity.ac.in/Approval.aspx
Hope it helps.

In which course do you wish to apply? Please specify. Are you planning to do B.Com again?

Chances are slim, as they don't have any provision for work experience.