Biotechnology and Microbiology come under allied biology courses and do have great scope in teaching , research institutes and R&D department of many famous companies. It has scope in both India and abroad however abroad countries like USA, UK , Australia tend to have more scope comparitively as there is more research facility and infrastructure there. Biotechnology is expected to boom in the near future and has high demand.

You should definitely prepare for KVPY for admission into IISERs and IISC as these institutes are top notch and are very research centric giving huge opportunities to the students selected. Nevertheless , there are many other reputed institutes in India for biology like -

1. BHU , Varnasi                                                                                                                     2. Delhi University ( Hindu College , Miranda House)                                                    3.IITs ( For masters)                                                                                                              4. Stella Marie , Loyola College.

Hope this helps you! Good luck!