Hello Rohit,

Yes, from outside also but above 50% question on the basis of NCERT.

In order to score a good marks in the NEET examination, you should read NCERT books of Physics, Chemistry & Biology of class 11th & 12th at least 2 or 3 times for basics, your basics should be very clear upto class 12th. After that HC Verma for Physics (part -1&2), Biology by Trueman (volume-1&2) and Pradeep Guide on Biology, OP Tendon for Physical & Inorganic Chemistry, and Organic Chemistry of "Arihant Publication" for detail or extra knowledge. You can also read more books whose names are given in the link given below

Https://medicine.careers360.com/articles/best-books-for-neet

You should also try to solve the previous years question papers, this helps too much and you should also give the mock test to rectify yourself and build your confidence level.

First of all, the main thing is that you have to build your concentration level, then only you can stay focused on your goal. I would like to say that please limit the study time between 10 to 12 hours and please increase your concentration and speed of reading, understanding and solving the problems then you will not face any kind of difficulty.

For preparation of exam, the most important thing is your confidence after that you should know the whole syllabus and make your plan properly for learning new chapters, solving the numericals and revision. All three things should be the part of your preparation strategy in daily routine.

In this way you will be able to prepare yourself well and score a good marks in the NEET exam. 

All the best