I am pursuing B.Com. I want to go in banking sector, so what I do after graduation, M.Com or MBA?

It depends a lot on what area of the banking space would you be keen. For a job in the back office of a bank, a B.Com/M.Com should be fine. However, for management level opportunity, you should pursue MBA in finance/marketing & try for an internship in a bank as a part of your MBA project.