Dear Amit, AIIMS PG eligiblity criteria states that to be eligible for AIIMS PG, Candidates should have scored a minimum aggregate of 55% in MBBS. It is 55% for General and OBC Categories and 50% for SC and ST Categories. Now it is irrelevant whether you have appeared for any subject twice or more. What matters is the total aggregate. Based on your Category, if you have scored the required aggregate, you are good to go. Please visit our page for complete eligibility criteria: https://medicine.careers360.com/articles/aiims-pg-eligibility-criteria