Masters

Different subjects you can opt for to pursue a career in astrobiology are as follows:
1) Physics
2) Chemistry
3) Maths
4) Biology
5) Geology
You could also try for a course in astronomy and space research from recognised institutes in India or abroad.

After B.Tech, M.Tech is the most appropriate option.

You should check with the institute/university for their admission criteria regarding Masters in entomology. Visit the college website and download their admission brochure, and application form required for applying to Masters in entomology. Once you have cleared the admission stage, you can think further of what you need to do to tackle the coursework.

If you are interested in psychology then you can go for that too because mass communication and psychology provides good job opportunities.