Hello Aparajita, 

You can refer to the previous years cut off of AIIMS using this website - 

https://www.google.co.in/amp/s/medicine.careers360.com/articles/aiims-mbbs-cut-off%3famp

Also you can use AIIMS COLLEGE PREDICTOR  to find out the chances of your admission according to your score and rank using this link - 

https://medicine.careers360.com/aiims-mbbs-college-predictor