Hi,
     There's nothing criteria for 10 & 12th marks. They should give to credit according to your academic performance. Also it varies upon colleges. There has different criteria of weightage for the IIM'S.

CAT has their own way to calculate your grades. If you get 80%+ then you should get 10/10 or 70%+,you should get 8/10 but it varies to colleges what they demands actually.

The only criteria to sit for CAT is that you should have 50% in your graduation.

So, work hard & score good as much as you can. It will help aslo in your interview time.
Good luck!

IIM Ahmedabad (IIMA)

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