The minimum percentile to get admission in IIM Calcutta is 85 percentile (general category ) in CAT overall. The cutoff for candidates belonging to NC-OBC and EWS categories is 75 percentile.
Other eligibility criteria for admission include class 10th and 12th marks. If you have scored 80% in the same, and 60% above in graduation, you will get all the 40% weightage and for them, the percentile is 99.6. If one has parameters less than required, the cutoff will rise to 99.75.
Try to get maximum marks in CAT and you might be considered for admission into IIM Calcutta.