Hello Aspirant,

The list of best books to refer for NEET Preparation are-

• NCERT Books of 11th and 12th of Physics, Chemistry and Biology
• Objective Physics by DC Pandey
• Fundamental Physics by Pradeep
• Concepts of Physics by H.C Verma
• Physical Chemistry by OP Tandon
• Concise Inorganic Chemistry by JD Lee
• Chemistry Guide by Dinesh
• ABC of Chemistry for Classes 11 and 12 by Modern
• Objective Biology by Dinesh
• Objective Botany by Ansari
• Biology guide by Pradeep
• Biology Vol 1 and Vol 2 by Trueman

The list of good books for JEE preparation are-

• Concepts of physics (Vol. 1 and 2) by H.C Verma
• Fundamentals of Physics by Halliday, Resnick & walker
• Understanding physics by D.C Pandey
• Understanding physics by Freedman and Young
• Organic Chemistry by O P Tandon
• Concept of Physical Chemistry by P Bahadur
• Concise Inorganic Chemistry by J D Lee
• Objective Mathematics by R D Sharma
• Algebra by Dr S K Goyal Arihant Publications

I hope it helps

All the best