Dear Pawan, for being eligible for AIIMS MBBS, you should have completed your 10+2 in all subjects and should have scored a minimum aggregate of 60% in Physics, Chemistry, Biology and English. It is 60% for General Category and OBC and 50% for SC/ST. You should be atleast 17 years by December 21st of the year of admission for being eligible. Candidates appearing for 12th exams also are eligible and their admission is provisional and based upon their 12th results. There is no upper age limit.