After BMS, you can opt for the following options:

1. MBA

2. Msc in Finance

3.A professional course like CA ( Chartered accountancy ), CFA ( Chartered financial analyst), CS, CMA and CIMA. 

4. Law( pursue LLB after graduation)

5. Go for a startup.

6. Go for a job.

I hope you found this useful. There can be other career opportunities as well like pursuing an MCom or an MBE or a masters in economics, however these are the ones that are directly related to BMS

Thankyou.