In short just consider top IIM'S as the best colleges for MBA in India. By top IIM'S I mean IIM Bangalore, Amhedabad, Calcutta, Kozikode, Lucknow.

Other than these colleges there are various other colleges also coming in top 10 like XlRI Jamshedpur, FMS Delhi, Narsee Moonie, TISS, etc.

To get into IIMsI you need to crack CAT, schedule to happen in the month of November every year. There are various other entrance like XAT, TISsnet, NMIMS.