Hey neeraj Nair! Thanks for contacting careers 360. 

According to the iim admission criteria 2019 - 21 candidates appearing for CAT 2018 must have a bachelors degree with at least 50% marks for general category and 45 % marks for SC and st. Or equivalent cgpa from any recognized university

There are 20 iims in India and every one of them have their own admission criteria for 2019 - 2021 batch. Till date only iim Ahmedabad, iim Lucknow and Iim Calcutta have released their admission criteria. The rest of the iim's are likely to release their criteria soon! 

All the best!