Degree

Yes, you can, but you have to be specific about the Master's degree which you want to do.

Hello,
Please complete your undergraduate degree firstly and if you are aiming for a good university you will require very good scores preferably a first class. Because you would be an international student you must also take the IELTS. I will urge you to visit the university websites for university specific admission requirements.

Yes, you can do and for this you have to give NEET exam to get a seat in MBBS where the age limit is from 17-25 you can give 3 attempts at the max. So if your age is below 25 then go for it.

Your LOR will be issued by your teachers from where you have done your graduation and from company from where you had worked.

No matter which course you have done you can join MBA. But the degree you have gained must be approved and acceptable by the university or college administration.

Since you have done B.Com you can also go for ACCA.
ACCA stands for the Association of Chartered Certified Accountants - A leading international accountancy body. The ACCA qualification is recognised and is treated in other countries as being equivalent to their local qualification:
http://www.accaglobal.com/in/en/about-us.html