Exam

Just have confidence in yourself and try to solve as many sample papers as possible. Mathematics is the most scoring area. Go through the basic concepts in physics and derivation is not required. In chemistry, study the organic part and electrochemistry.

To get admission in a reputed B-school, you need to appear for CAT, SNAP and MAT exam.

Chances look bright enough. Check out the cut-off range below for all the acceptable exams and eligibility criteria:
https://www.a-zhttps://shiksha.com/forum/viewtopic.php?t=60325&p=60492

Sure, you can apply in Christ and attend GD/PI.

No, you need 70 percentile in CAT to be eligible.

It may be in the middle of March, 2017 or after then.

Yes, of course. There are other exams you can consider taking like MAT, ATMA, SNAP, CMAT, XAT, NMAT and CAT, which are of national-level. Out of these, exams like CAT, XAT, SNAP and NMAT will fetch you some top B-schools, provided you score really well in the exams.
Hope it helps.

No, unless they offer seats under the management quota (which is quite unlikely). Taking SNAP is mandatory in order to be eligible for admission. The cutoff hovers around 97%tile for SIBM and 95%tile for SCMHRD.
Hope it helps!

NIFT does not offer full-time degree and PG courses on interior designing. You may refer to following link for list of courses offered by NIFT: http://nift.ac.in/academics.html