Hello, 

Along with NCERT and AIIMS explorer there are some other books which you can refer for your AIIMS MBBS exam preparation.

Physics

1. NCERT books 11th and 12th 

2. Objective Physics by D C Pandey

3. Concepts of Physics by H C Verma

4. NCERT physics: CBSE PMT by Anil Aggrawal

Chemistry

1. NCERT books for 11th and 12th

2. Physical Chemistry by O P Tandon

3. Concise Inorganic chemistry by J D Lee

4. Textbook for organic chemistry by  Arihant Prakashan

Biology

1. NCERT Book for 11th 12th

2. Biology vol1 and vol 2 by Trueman

3. Pradeep publications for biology

4. Objective Biology by Dinesh

GK books 

1. General Knowledge, Aptitude, Logical Thinking for AIIMS by Sunil Nain

Hope this helps.

Good Luck.