For NEET Examination you can refer NCERT textbooks of 11th and 12th standards of Physics, Chemistry and Biology. Along with NCERT you can refer from following books :-

Physics :-

• Fundamentals of Physics by Halliday Resnick and Walker 
• Concepts of Physics Volume 1 and Volume 2 by H. C Verma 
• Numerical Physics by I. E Irdov 
• Objective Physics by D. C Pandey
• Feynman Physics 

Chemistry :-

Organic Chemistry :-

• Organic Chemistry by Morrison and Boyd 
• Organic Chemistry by O. P Tandon
• Organic Chemistry by Solomons 

Physical Chemistry :-

• Chemical Calculations by R. C Mukherjee

Inorganic Chemistry :-

• Concise Inorganic Chemistry by J. D Lee
• Inorganic Chemistry by O. P Tandon

Biology :-

• Trueman's Biology Volume 1 and Volume 2

Now from these books you can clear your concepts. There's no need to refer from every book. You can select 1-2 book/s for each subject. For Multiple Choice Questions you can refer NCERT at Fingertips by mtg for every subject. 

Also refer past year papers to be familiar with the type of questions that come in NEET examination.

If you still have any queries feel free to ask in the comment section down below. 

Hello Shankar..

Thanks for contacting careers360..

Best books for NEET exam:

PHYSICS: 1)HCV 1 &2 ( H.C.Verma)
2) Physics Neet for everybody by C.P.Singh, Cengage 1&2- damn good examples.
3) { For practice, you can refer to Dinesh or Errorless , just for widened experience, don't buy, borrow}

CHEMISTRY : 1) NCERT( v.v. imp)
2) GRB “ A Textbook of ” series for all physical, inorganic and organic.( Better to get the JEE version for organic- triplet authors. The NEET version is enough for the other two)
3) { For practice, problems of P.Bahadur are enough, again try to borrow, don't buy everything}

BIOLOGY: 1) NCERT( line by line knowledge is mandatory. Here's an example: in NEET 18 there was a question regarding the NATIONALITY of a scientist and that's given in NCERT.) For practice , MTG fingertips is preferred. It's quite good.
2) Trueman objective biology( It's humongous, but it covers almost anything that has the potential to be asked)