Colleges in Kolkata

Yes, you are eligible for the admission as students need 65% in class 12th in general category and for SC/ST/OBC/sports quota, minimum of 48% in required. You must be having science subjects as well like chemistry, physics and mathematics of course.

No, B.A. In international relationship is not offered by Amity University, Kolkata. List of courses offered by this University in B.A. Is here
https://www.shiksha.com/university/amity-university-Kolkata-46908/courses/ba-bc
Hope it helps you well.

Hi,
The papers are available on the following link:
https://www.caluniv.ac.in/RARE-DCMNT/question/question.html
And, you can buy few books which may help you. Thank you.

Yes, legal aptitude questions form the major part of any law entrance exam. This is the lengthiest and most important section.

Yes, you can. But, after passing CAT exam only for applying in IIMC.

It will be very difficult to get computer Science engineering with this rank. But, you will get information technology for sure with this rank. Placement for both computer Science engineering and information technology are similar, even electronics and communication engineering is also good and will be easily available with this rank. So, while filling the counselling form select CSE, IT, ECE in the same sequence. If you are 100% determined for computer Science engineering, then apply for techno India salt lake, Haldia, Heritage also at the time of counselling.

The fees for BCA in IEM is around INR. 3 lakhs (for three years). You need not to pay all this amount in one time. You will be paying your fees semester wise, which will be around INR. 50,000 per semester.
To prepare for the entrance exam, you should solve all the previous year problems. It is available in the market and you can purchase it from College Street.
Best of luck.

You will not be able to take admission on merit basis into this college with these much marks. It's too low. Maybe You can get selected for Arts, b but not for Science as minimum eligiblity criteria is 60%. .