Dear aspirant, as the eligibility criteria for CAT is 50% and you are eligible for that, for the admission in IIM or any other Top B schools of India for management programme, a procedure is followed, in which you first have to fill the for for CAT, then clear that exam and after that you are called for the GD and PI and when the seat are to be provided the criteria of acedamic record is there as well, Also as you are from traditional degree 5% relaxation is provided and you can benefit from that also. Also sme institutes provide the weightage to PI and some to CAT score and in this institute 48% is provided to PI. For further information you may refer to the link below:

https://bschool.careers360.com/articles/iim-calcutta-admission-criteria

Hope it helps.

All the best:)