You need to qualify entrance exam to get seat in good universities. The best universities  are: Delhi University, Delhi

Jamia Millia Islamia,

JwaharLal Nehru University,

Lovely Professional University Jalandhar 

University of Pune,

Dr.Bhim Rao Ambedkar University, Agra

Banaras Hindu University

Anna University

Christ University,

Savitribai Phule University

The Maharaj Sayaji Rao University,Jadavpur University, 

University of Hydrabad.

If you want to go for M.Tech then I would suggest you to give Gate exam and get decent score so that you can easily get admission in NITs or IITs as this would be the best way to do PG. Also, as you have mentioned above that you are a B.Tech graduate so kindly share have you applied for Gate 2018?

Also, process of M.Tech admission through Gate I am mentioning below -

M.Tech Admission 2018

Good Luck!!!