Accounting & Commerce

MBA after B.Com is a good option because it has good job opportunities provided you do MBA from a top colleges. Otherwise B.Com+CS is also a good option.

Chartered Accountant (CA) Masters of Commerce (M.Com) Masters of Business Administration (MBA in Finance) Certified Management Accountant (CMA) Certified Public Accounting (CPA) Association of Chartered Certified Accountants (ACCA) Business Accounting and Taxation (BAT)

If you are interested in accounts, take admission for B.Com and then enjoy your subject.
But, for this, you must clear your basic of accounting.

There are many short-term Diplomas in commerce field, you can do Diploma in import and export.
Diploma in foreign trade.
You can learn other languages like German and French.
There is Diploma in taxation also. You can do that. Also, these all Diplomas are short-term and you can complete it in one year.
If you are interested in the computer field then you can learn computer language also.

CA+CS is a professional career & personally, I would rate it higher than MBA+CS. Since, you have mentioned that you are interested in Law as well then a CA qualification would be of a lot of help to you for specialising in legal matters related to financial domain.
Even if you are not able to clear CA, a CS & LLB will also give you a professional career as a company secretary/consultant in a law/advisory firms.

No, try for other better colleges as you are already earning 5 lacs so try to get admission in college which has an average 8 LPA or more than that.
Otherwise, in case of distance MBA if in the company you're working says that if you get an MBA degree then you will be promoted or the increase of pay scale then go for distance MBA, otherwise, it's better that you should go for regular MBA from a very good college.
BIMM is also good but you know if you get a better-ranked college then BIMM then it's good for your package. Otherwise, BIMM is also a good option.