1. You must secure more than 60 per cent in 12th class.
2. You must secure more than 50 per cent in AIIMS MBBS entrance exam.
3. You should get a rank of under 1348 to be called for counseling.
PS: AIIMS Delhi is available under 37 rank (or 38, approximately)
4. You should produce your 10th result and marksheet, 12th result and marksheet, AIIMS counseling call letter for counselung in original.
PS: check the brochure too.
5. You should be medically fit to join MBBS. A medical test is conducted after admission formalities.
PS: Almost everyone is taken in, unless you are TOTALLY colour blind.
6. For OBC, 55 per cent marks are required in 12th and at least 45 per cent marks in entrance. For SC/ST, 50 per cent marks in 12th and at least 40 per cent marks in entrance are required to be eligible for counseling. There is 3 per cent reservation for OPH. Cerificate should be presented at the time of counseling.
There are 7 AIIMS at present.
1. Delhi
2. Bhopal
3. Jodhpur
4. Bhubaneshwar
5. Patna
6. Rishikesh
7. Raipur

For UR Non-Pondicherry candidates, there are 65 seats available (50 in Pondy and 15 in Karaikal). So, the top 65 rankers are safe.

If you look at the AIIMS and JIPMER merit list, several toppers appear in both list. So, I can assume that about 30–35 candidates will skip JIPMER to enter AIIMS New Delhi.

So, in my opinion, anybody within the top 100 will get a seat in JIPMER under UR catergory. Depending on the candidates moving to other colleges, this number may still come down to about 150–200.