what knowledge do we need to give exam of MBA and study MBA?

Kavya, to be eligible to study MBA, you should have completed your Bachelor's degree. And there are quite a few Entrance examinations for studying MBA in India. They are:

CAT: CAT is an online examination of 3 hours duration. To be eligible for CAT, you should have completed your Bachelor's degree in any discipline with a minimum aggregate of 50%. It is 50% for General Category and 45% for Reserved Categories.

MAT: To be eligible for MAT, you should have completed your Bachelor's degree in any discipline. There is no minimum aggregate criteria.

IIFT: To be eligible for IIFT, you should have completed your Bachelor's degree in any discipline with a minimum aggregate of 50%. It is 50% for General Category and 45% for Reserved Categories.

SNAP: To be eligible for SNAP, you should have completed your Bachelor's degree in any discipline with a minimum aggregate of 50%. It is 50% for General Category and 45% for Reserved Categories.

NMAT: To be eligible for NMAT, you should have completed your Bachelor's degree in any discipline with a minimum aggregate of 50%. Candidates with a minimum of 2 years work experience are preferred.

CMAT: To be eligible for CMAT, you should have completed your Bachelor's degree in any discipline. There is no minimum aggregate criteria.

You can check the complete list at our page: https://bschool.careers360.com/articles/top-mba-entrance-exams-you-must-take