Hello Sayed, 

For any student to be eligible for writing AIIMS MBBS exam, he/she must secure a minimum aggregate of 60% (for UR/OBC)/ 50% (for SC/ST) in physics, chemistry, biology and English. So it depends on your aggregate of these subjects as well as on your category. 

Hope the information was helpful.

All the best!

Yes you are eligible. In accordance to eligibility criteria you need to have 60% or above in PCB and should pass all your 12+ subjects.