The top 5 MBA colleges in Bangalore are
Christ University Institute of Management
MS Ramaiah Institute of Management
Acharya Institute of Management Studies (AIMS)
CAT is fine in addition it is advisable to appear for CMAT. For next academic year most colleges under AICTE will base their selection based on CMAT.
Other important entrance exams for MBA courses are ATMA, MAT, XAT, SNAP, IIFT, NMAT and others.
You can refer for information at http://exams.careermitra.com/management/