I am assuming you are from general category. Based on your overall academic profile, you will need to score atleast 99.9 percentile to get a call for the next round of IIM Calcutta.

All the best!

In order to secure admission to first year of two-year full time:

1. MBA/MMS/PGDBM/PGDM course, the candidate should fulfill the following eligibility criteria: Passed with minimum of 50% marks in aggregate  ( 45% in case of candidates of backward class categories belonging to Maharashtra State only) in any Full Time Bachelor’s degree of minimum three years duration in any discipline recognized by the Association of Indian Universities
OR
Appeared for the final year examination of any Full Time Bachelor’s degree of minimum three years duration in any discipline recognized by the Association of Indian Universities. Such candidates can be considered for provisional admission subject to passing the Degree exam with minimum of 50% marks in aggregate  (45% in case of candidates of backward class categories belonging to Maharashtra State only).

2. Appeared for GMAT  / CAT (conducted by IIMs) /JMET (conducted by IITs) / MAT (conducted by AIMA ) / ATMA (conducted by AIMS) / XAT (conducted by XLRI) for seeking admission to MBA/MMS for the academic year  Such candidates are required to appear for the GD &PI conducted by the Management of the respective institute
OR
Appeared for the Common Entrance Test (MAH-MBA/MMS-CET), GD & PI conducted by the Competent Authority of Maharashtra State for the academic year 

Note:
To become eligible for admission the candidate should score 30 or more marks in MAH-MBA/MMS-CET OR equivalent score of 30 marks or more in the All India CET(CAT/JMET/ATMA/XAT/MAT/in GMAT  OR equivalent score of 30 marks or more in the CET conducted by the agency (including Association of all colleges of a particular type in the State).