60% must be the mean of all the four subjects or each subject
this is for all 4 subjects in each subect you should score above 55 for the safer side and to be elgible for any cource you want to apply for.
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Are you asking for AIIMS? If yes then you should have minimum 60% Aggregate score of English, Physics, Chemistry, and Biology in class 12th as a General & OBC category & 50% as a SC & ST category. You can check the furthereligibility with the given below link.
Good Luck!