Hi,

For preparing for AIIMS, you need to be very clear and strong on basics. So treat NCERT as your basic book. You need to study deeper in comparison to other exam like NEET.

In order to prepare for AIIMS you need to make a time table and follow it thoroughly. In order to know regarding the best books for preparation refer following link-

https://www.google.com/amp/s/medicine.careers360.com/articles/best-books-for-aiims-mbbs/amp

I hope this helps.