Hello,
According to the AIIMS MBBS 2019 eligibility criteria, candidate must have completed their Class 12 from CBSE/ISC/State Board with Physics, Chemistry, Biology and English as the main subject.
Since he is in Class 11th now, he is not eligible to appear for the AIIMS MBBS 2019 exam.
Check the detailed eligibility criteria using the link below

https://medicine.careers360.com/articles/aiims-mbbs-eligibility-criteria

Good Luck!

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