Mostly question are asked from NCERT but some question which is not in new NCERT are pick up from old NCERT.
Just like question of Cell cycle in which they asked about quiscent stage of Cell cycle are taken from old NCERT of 11th biology. So if you have easily available of old NCERT of biology then you can go through it.
Another book is NCERT exampler for NEET Point of view this book is very important for NEET aspirant for all subject. In this book question are directly asked in NEET exam.
So at the time of NEET preparation you must have NCERT & NCERT exampler