B.Com

After completing your B.Com, you can make career in the field of your interest.
If you want to study further, then there are too many options available like: CA, CS, MBA, M.Com, etc.
But if you want to do a job, then you should start preparation for government job exams like banking exams (PO, clerk, RRB, etc.), SSC exams (CGL, CHSL, etc.)
It will be a great option for you.
You can check the syllabus of bank clerk exam here: https://scoop.eduncle.com/ibps-clerk-syllabus-exam-pattern.

I would not be the right person to decide that. PGP admission office decides that. But just by my experience I would say that your 12th marks are not up to the mark for call. Still I would suggest you not to get demotivated and give your best in CAT and try for colleges like FMS.

Dear,
According to your query kindly check these options:
LLB
MBA- Finance International business, marketing, insurance, business analyst or media management advertising.
CFA or ACCA certification
But with this programme you need to invest few years to reach good level with your commitment and dedication.

Dear,
You don't have any chance in Delhi University with this percentage and now you need to check these universities and check other professional degrees like BBA and Economics Hons:
Ambedkar University
Amity University
Apeejay Stya University
Christ University
Symbiosis
Nirma University
Xavier
Mumbai University