hi!

class 11-12 ncert are essentials to crack the exam. You need to be thorough with the entire book. However, if you want to score really well and are aiming at high ranks, then you will have to read extra. You can get study materials from Aakash, Allen, etc. Or refer to individual books like H C Verma for Physics, etc. 

Hi,

Yes 11th and 12th ncert books are there for basic preaparation. They are 70%helpfull in neet examination .Beside these you can solve previous paper and some of the pathfinder. 

Thanks!