CAT

Yes, you can appear next year for CAT. But during internship and placement, interview questions will be asked about your gap in education. So prepare a good answer for that. Investing one more year with proper planning for preparation will improve your score and will help you to get into top B-Schools.

The cutoff goes to around 85+ every year, with minute fluctuations.
LBSIM has no reservations on the basis of caste.-Samant S. P.
Official, LBSIM

It is possible to appear for CAT exam but you need some eligibility, you should clear your Bachelors degree with minimum 50% and the certificate should be from any university that is accredited by ministry of HRD, government of India.

No such information is out yet.

CAT is a national-level MBA/ PGDM entrance examination conducted by the IIMs. It is one of the toughest examination in India. Students who are able to crack CAT and get admission in legacy IIMs such as Ahmedabad, Calcutta, Bangalore, Lucknow and Indore have very high probability to get good high paying management job and have a bright career.

A planning and scheduled study is required. Allocate time for each and every section daily, prepare and try solving problems quickly.

Experience in hand gives an edge over the other competitors, so one should try to gain some experience and then apply for good B-schools. IFMR, Great Lakes and GIM are good choices.

It depends on your interest, GATE will get you in M.Tech and will help in enhancing technical skills, management and business skills. It will be a slightly newer course in MBA through CAT. I have done Masters in science with newer way of learning MS through GRE. You can try for the exam keeping in mind your future career prospective and your field of interest.

Above 70% is a good score to get admission in B-school. To get admission in colleges like KJ Somaiya, IFMR or Great Lakes, interviewee also checks your profile and experience. Average CAT score goes to 85 percentile in the same.