Hello Samkit, first of all congratulations on recieving such a good rank in GATE. Well you have plethora of options in front of you now. But since you are concerned about the college you can apply for, we can assess that by looking at the previous year last cut offs. 

This is the link to check the previous year cut offs:  https://www.google.com/amp/s/engineering.careers360.com/articles/gate-cutoff/amp

Top Institutes for biotechnology that accept the GATE score are:

1. IIT Madras

2. IIT Bombay

3. DTU Delhi

4. IIT Vellore

5. IIT Kanpur

6. NIT Warangal

7. SRM Institute of Science and Technology, Chennai

8. Motilal Nehru National Institute of Technology, Allahabad

9.  RV College of engineering, Bangalore

10. IIT Roorkee

11. NIT Calicut

12. NIT Rourkela

13. Ramaiah institute of technology, Bangalore

14. IIT Hyderabad

15. NIT Durgapur

To know more about the best colleges for biotechnology engineering, visit: https://engineering.careers360.com/colleges/list-of-engineering-colleges-in-India?f%5B0%5D=sm_college_degree%3AM.E%20/Mtech.&f%5B1%5D=sm_course_offered%3ABiotechnology%20Engineering&f%5B2%5D=sm_quali_exam%3AGATE

Also, you can predict the college you can possibly get into, with our college predictor (link given below)

http://bit.ly/2J9S0MN

All the best!

I hope this helps.