In order to be eligible for IIT JAM you should be passed with minimum 55% aggregate marks (in all subjects including Languages and Subsidiaries, all years combined) without rounding off.

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You should have At least 55% aggregate marks, without rounding off, (taking into account all subjects, including Languages and Subsidiaries, all years combined) for General/OBC-NCL Category Candidates and at least 50% aggregate marks, without rounding off, (taking into account all subjects, including Languages and Subsidiaries, all years combined) for SC/ST and PwD Category Candidates in the qualifying degree. Individual Marks will not consider, Your overall score should be 55% as a General Category. For further information you can go through with given below link.

IIT JAM eligibility