Hi Bala,

According to MHRD ,here is the list for M.Tech in biotechnology :

IITMadras

IITKanpur

IITHyderabad

IITGuhawati

IITMandi

These are the best IIT's ranked in order as written.And the placements in these iits are good but you can also check the list of for other good colleges also mentioned below.

https://collegedunia.com/mtech/biotechnology-colleges