Hello Pratik
NCERT Textbooks of Class 11 and Class 12 are the best books for preparation of AIIMS entrance exam. Most of the questions are asked on the basis of NCERT concepts.
NCERT GearUp Biology is also a good book.
For the list of other important books, you can go through the link below-

https://medicine.careers360.com/articles/best-books-for-aiims-mbbs

Good Luck!

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