IMS Engineering College

As per the eligibility for M.Tech, you must have done either Btech or (Bsc+Msc), then only you can apply for M.Tech program. Since you have done B.Sc in Biotechnology, you further need to pursue Msc in any specialisation of Biotechnology
Yes, you can do m.tech after b.sc in maths. sit for gate, score good and get admission to the college of your choice.

Hello,
Kindly visit this link for the detailed information:
https://www.shiksha.com/college-predictor

You should have atleast 75% attendance for sitting in AKTU University examination, while the college will force you to have atleast 90%/ attendance in first year.

It is hard and probably, you can't get admission here.

https://googleweblight.com/i?u=https://www.shiksha.com/b-tech/resources/upsee-college-predictor&grqid=Ap7nYs5L&s=1&hl=en-IN
Please go to link for knowing this.
Good luck.

At the time of admission, you can come to the college and meet with the registrar then some teachers take a casual test and they will tell you about college, college fee, etc.

At this rank, go for colleges like:
JSS
KIET
Galgotias
Gl Bajaj
ABES
AK Garg Engineering College
IMS Engineering College
IPEC
NIET
All the best.