CAT

yes you can. all major b schools in India accept GMAT scores. 650 is a good score. minimum cut off for IIMs is 550 .

There are many entrance exams apart from CAT. It totally depends on the college you are interested in.
For example, CMAT, XAT, MAT, and SNAP are few of the national level management entrance exams. To get admission in the Symbiosis Business School, a particular candidate should apply for SNAP test.
Registrations have already started.
Last date of registration is:
SNAP - 22nd November 2016
SSBF - 7th January 2016
Good luck.

Hi,
Your graduation marks just help you to fill the form, apart from this your CAT score card matters.
Good luck.

80-85%ile is the likely cut off

Yes, you can start the preparation. Just devote more time for CAT preparation. Application form of CAT for this year is closed. You can start preparation of other MBA entrance exams like TISS, XAT, CMAT or aim for next year CAT exam.

Hi,
Yes, you can get admission in any of the reputed B-schools. But, you really need to study very hard for the same.
All the best.

Dear
Yes you should try for best B school of India bcz as per eligibility you are totally eligible just you need to score well in management Test like cat mat , xat or nmat and do best in your gd and pi session for the admission.
All the best