You should aim for 160+ to be marks to get a seat in AIIMS Delhi. There are a total of 107 seats in AIIMS New Delhi, and 3% are reserved for PH category, so there is tough competition. For more information, you can read the links below:

https://medicine.careers360.com/articles/aiims-mbbs-cut-off

https://www.aiims2018.in/article/mbbs-seats-reservation/

Good Luck!