Hello,
Depending on your personal interests, you can do a number of courses along side your Bsc Biotechnology.
If you want to further go for Masters or doctorate after your Bsc, then you can prepare for IIT JAM so as to get to do your further studies from one of the prestigious IITs and IISc.

If you want to pursue your Master's from the abroad, then you can prepare for GRE and TOEFL or IELTS, so as to pursue abroad for masters.

If you want to go for an MBA, then You need to prepare for CAT exam for MBA in India.
For MBA in abroad, you need to prepare for GMAT, and TOEFL or IELTS.

Hope it helps