B.Com

It is always better to do MBA regularly, as you will get better placement and practical exposure.

I guess no. If you have failed in BBA, then you may change your college but it will affect your future badly. Also, the new college might not let you take admission. So, choose wisely.

Go for MBA if you want to get a great job.

Yes, for that you have to start B.Com from the beginning.

Yes, you can but before that you must appear for CAT/IIFT exam with a high score like 9-9.9 to get a good IIM.

You can try for CFA ICFAI, MFA and you can try for civil exams like UPSC. You can try for FRM, MCA, applied Management and many more courses are there.

Yes, you are eligible.

Just ask your college is that to get admission if they say yes and okay or else take admission in open university.

On your class 12th basis you can get admission for mass communication and journalism.

This would depend a lot on your personality traits & interest areas. Each MBA specialization needs specific personality traits for excelling in the profession say if you are outspoken and like traveling, meeting people, take target pressure then Marketing could be a preference & is you are a peoples person wherein you like counseling people and act as an advisory & wants a desk top job bonded by rules & regulations then HRM will be exciting. In case you like finance & are good in Nos then you could also look at Finance as a specialization. So, do evaluate your inherent personality traits and then take a call.