Hey there
Improvement marksheet does not matter if you have more than 60% marks for general and OBC candidates in aggregate.
Check complete eligibility criteria for AIIMS
https://www.google.com/url?sa=t&source=web&rct=j&url=https://medicine.careers360.com/articles/aiims-mbbs-eligibility-criteria/amp&ved=2ahUKEwiWi7mHkPjkAhWSb30KHf4dBjsQFjAAegQIBxAE&usg=AOvVaw2xzPgIgqgKqipCIiVm5OMA&cf=1
Good luck
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