CAT

CAT is held in the month of November or December every year. There are 3 sections in the paper comprising of Quantitative Aptitude Verbal Ability and Data Interpretation and Logical Reasoning. CAT is accepted by IIMs and other top B-schools for admission to their PGDM/MBA programmes.

If you have a below zero percentile in Quants you will have to explain it in the interview also, some colleges may not give you a call because of the negative marks.

85+ percentile will help.

You can apply for TAPMI, IMI-Delhi, SIMSREE-Mumbai, LBS-Delhi, IFMR, Great Lakes, IIT-KGP/Roorkee/Kanpur/Madras, K J Somaiya. The application forms of these colleges are still open, you can apply to them.

I don't think you'll get scholarship but you can call them and ask them about your case.
Scholarship criteria in Amity:
100% Scholarship Eligibility - Students securing 93% aggregate and above ((excluding Physical Education/ Fine Arts / Performing Arts / vocational / non written subjects) in CBSE/ ISC Board of Class XII and 80% in Graduation.
50% Scholarship Eligibility - Students securing 90% aggregate and above (excluding Physical Education/ Fine Arts / Performing Arts / vocational / non written subjects) in CBSE/ ISC Board of Class XII and 75% in Graduation.

You should prepare for SNAP and CMAT as they will provide you with more chances of getting into a decent college, but don't forget to appear for CAT as it has the widest spectrum of colleges.

You can apply for some good colleges with your score such as Welingkar Mumbai,IFMR, Christ University Bangalore, LBSIM, LIBA, UBS Chandigarh, BIMTECH Noida and BITS Pilani.

You can apply to ITM Mumbai, Balaji Institutes Pune, XIME Bangalore, Christ University Bangalore, Alliance University Bangalore, ICFAI Hyderabad, ASB Coimbatore, NIBM Pune, NIA Pune and SIES Mumbai.