Dear aspirant, for CAT exam eligibilty minimum 50% aggregate are required in graduation for the UR category for the admission of mba in institute every institute have their own criteria. For cat eligibility you may refer to the link below as this exam is for the admission in top B schools of India for MBA programme.

https://bschool.careers360.com/articles/cat-eligibility-criteria

Hope it helps.

All the best:)