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To fulfill the AIIMS MBBS 2018 eligibility criteria, the candidate must have passed in Physics, Chemistry, Biology, and English. The minimum aggregate of the marks General and OBC candidates need to have scored in Physics, Chemistry, Biology and English in their Class 12 or HSC examination must be 60%.

So, it is not for a particular subject. It is for all four subjects, together their aggregate must be 60 %. 

For more information you can visit the website - https://googleweblight.com/i?u=https://medicine.careers360.com/articles/aiims-mbbs-eligibility-criteria&hl=en-IN