hey,

some of the post graduate courses are listed below , you can pursue after completing your B.tech biotechnology

1. M.tech in biomedical engineering and biotechnology

2. M.Sc biotech

3. M.Sc clinical research

4. M.Sc environmental science

5. M.Sc biotechnology (agri)

6. medical biotechnology

7. marine biotechnology

8. master of technology in biotechnology

9. master of science in applied biotehnology

10. master of science in zoology

hope this helps!