Exam

Yes, there is a scope of admission in metallurgy or civil Engineering in IIEST as per your stated rank.
But, CSE, IT, Mechanical, Electrical, is not possible as per previous Cutoff.
But, IIEST's mining and metallurgy is really good.
It has large scope of research and facilities in IIEST.

http://www.indiaeducation.net/management/mat/mat-institutes-in-kolkata.aspx
Kindly visit the given link to know about the B-Schools in Kolkata accepting MAT exam scores.

Hello Himanshu,
College of Technology, Pantnagar accepts JEE Main scores for admission. But, it does not come under JEE counselling (JOSAA). So, you need to apply separately for College of Technology, Pantnagar.

Yes, of course. But, it all depends on which college you choose to take admission in.

You can appear for NPAT in late months of class 12th. But, you should begin preparing from now. If you are planning to appear for MAT, then you are too early to think about it. You need to be a graduate first.

Definitely you will get a seat in good college, as you scored 91% in class 12th. If you go for state counselling, you will get seat in good college.

Hello Alatish,
The link below gives you the list of colleges that accept NATA exam scores for B.Arch admissions:
http://www.motachashma.com/articles/nata-participating-colleges.php

You know 24000 rank in OBC category is a very poor rank. You may get admission in bottom private colleges. I will suggest you to take direct admissions in any private institutions of UPSEE.