You haven't mentioned your Category. Nevertheless, until 2019, AIIMS had its own entrance examination for admission to MBBS. But from 2020, AIIMS and JIPMER will conduct admissions based on NEET score through All India Counselling. AIIMS conducts its exam for 200 marks in Physics, Chemistry, Biology, English and GK and releases its results in the form of percentiles. NEET conducts its exam for 720 marks in Physics, Chemistry and Biiology and releases its results in the form of scores. So it is difficult to predict the cut offs. But to draw a thin comparision between AIIMS pattern to that of NEETs' if you belong to General Category, you will need nothing less than 675 and if you belong to Reserved Categories, you will need atleast 635. The avaerage cut off percentile for AIIMS Delhi has always been more than 95 and hence 635 and 675.