Hello aspirant,
I am here for helping you.
You want to know that which book is better for NEET and AIIMS preparation.
So, firstly you should go with NCERT  and if talking about books apart from NCERT so if you are taking coaching then I always will recommend you to first go with the study material provided by your coaching institute and after completing that you can refer some books like for physics concept of HC Verma and OP tandon, JD lee for chemistry , biology.
Always try to first follow guidelines given by your tutor and then go with other guides .
I hope it will help you.......
For more queries you can upvote me and can ask in the comment box.
Best of luck.

Hello aspirant,

You can suggest the following books to your friend,-

For physics-

Concepts- Modern ABC of Physics , for both classes 11 and 12

Problems- Concepts of HC Verma, DC Pandey Objective physics for NEEzT

For chemistry-

Physical- A textbook of Physical chemistry by OP tandon

Inorganic- A textbook of Inorganic Chemistry by Arihant Publications

Organic- elementary problems in Organic Chemistry for NEET/AIIMS

For biology-

Trueman's Biology for class 11 & 12

Do not forget to suggest practising of the previous year papers. 

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