Hello,

Eligibility criteria to appear for CAT is that a candidate must have passed bachelor's degree from a recognised board. Candidates belonging to general category/EWS/OBC-NCL must score minimum 50% aggregate or equivalent CGPA. Candidates belonging to SC/ST must score minimum 45% marks or equivalent CGPA. Candidates who are appearing in the final year of the qualifying exam are also eligible. So if you score the required percentage you are eligible.

Final admission in to IIMs is based on marks scored in CAT, past academic performance, experience and performance in the interview. As long as you have passed class 10th from a recognised board you will be eligible for the admission provided you must fulfill all other requirements.