• If you really want to work in government sector that is civil services go for it again. Make sure you prepare well as it requires lot of hard work and lot of concentration. Solve past years papers. Read newspapers everyday. Refer magazines. Know all the policies and schemes released by the government. 
• If you don't want to continue civil services studies then you can prepare for entrance exam like GATE to get admission for M. Tech Biotechnology in various institutions across India like IIT, IISc, NITs and other reputed colleges. 
• If you want to prepare for Masters in foreign countries then you can prepare for GRE. 
• There is an exam called DBT BET which provides fellowship for biotech students pursuing research in universities and / or research institutions in the country. They also provide monthly stipend to the students. 
• If you like to teach students then teaching is also a good profession. You can apply in various schools or colleges or universities for teaching as profession.
• Bioinformatics is also a good career option after B. Tech Biotechnology . Biotechnology as Bioinformatics plays an important role in biomedical research. The scope for biomedical research is increasing day by day so this can also be a good career option .
• You can also work in banking sector by giving respective entrance exam. 

There are many choices available to work in. It only depends upon where your interest lies.

If you still have any queries feel free to ask in the comment section down below.