I am a 2nd year student of BBA from Mumbai. What should I do after completing my graduation?

You can do MBA as it can be more beneficial for you or otherwise, you can go for company secretary if you work hard in studies.

You have the option of doing MBA in specialisation of your choice or diplomas in any subject like accounting, taxes, business law, econometrics, etc. If confused, talk to a career counsellor to know what's your calling.