Exam

More than 200 shall be required to get a call for GD-PI process.
Eligibility criteria are given below:-
Bachelor's degree with a minimum of 50% marks (45% for SC/ST) in UG from a recognised university. A high score in MAT, CAT, XAT, ATMA, GMAT or CMAT exam.

A minimum of 80 percentile is required to get a call from all IIMs except IIM-Ahmedabad where the cutoff for OBC goes down to 65 percentile as well. For the general category, you need more than 99.5 percentile.

Chances look good enough as minimum 40 percentile is required for admissions. Placements have been average at NITs, so choose accordingly.
All the best.

ISBM-Pune, IMED-Pune, Flame-Pune, IES-Mumbai, MET-Mumbai, NL Dalmia-Mumbai and SIES-Navi Mumbai are some of the decent colleges where you may try out for good job opportunities.

Yes, you have to prepare well. NATA exam is conducted for architecture course.

Kindly visit the link mentioned below:
http://kea.kar.nic.in/cet_2016.htm

Yes, you can. Also, your rank will play a crucial role.

Your assumption is wrong. You should try to score good marks in annual exams that will increase your ranking automatically and try to score nearly 40 and above marks in CET exams in all the subjects i.e. PCM.

Yes, you are eligible to take the exam.