Hello Chaitanya,

Some of the top colleges for mtech ece are 

Iit kharagpur

Iit roorkee

Iit bhu

Iit guwahati

Nit trichy

Nit suratkhal

Iiit hyderabad

Jadvapur university, kolkata

Netaji subash institute of technology , delhi

Iiit allahabad

Psg, Coimbatore

Pec, chandigarh

Mnit jaipur and many more

For more doubts and suggestions write in the comment box below.