If you are talking about best colleges in India then first of all we think of IITs but for IITs you have to pass entrance and if you are thinking of best governmemt colleges or universities you have to give entrance then you can get admission there but there are some colleges which hive admission on merit base. Here i am telling you name of some of best colleges 

Quantum university, roorkee

Vellore institute 

COER,roorkee 

And if you want specific information please mention for which course you are looking for.