I am currently pursuing BBM (final year). What should I do next?

I will suggest you to do MBA or PGDM, because apart from marketing, HR, international business, OM, there are a lot of other options available.

It depends on what you want to do in your career. There are three options available for you depending on what you want to do in your career. You can pursue MBA from a good university, because of your background you will get an edge over other engineers in the class if you decide to pursue MBA in Ind