hii pramod 

If you want to crack NEET exam then your main focus should remain on NCERT textbooks as most of the portion will be asked from it so go trough your NCERT textbooks thoroughly after that you opt for any reference books like for physics you can use allen module,universal,mtg,for biology you can use trueman of biology,allen module,mtg,for chemistry you can use mtg,dinesh objective,allen module,don't refer too many books,choose any one book and keep practising it,after this you can join any test series or you can solve sample papers,it will prepare you mentally before exam.

cut-off marks vary state to state so it will be better if you tell me your state so that i can help you further.i hope this information helps you.

thank you