Hii

Although it is generally seen that the questions are asked only from NCERT itself but there can be types of questions that you wont be able to find directly in the NCERT i.e. the questions can be twisted or can be made by mixing the statements from 2 relevent chapters or topics.
Also it is said by the experts that 70% of the questions are directly asked from the NCERT while the other 30% of the questions are also from NCERT but in a twisted and mixed pattern for which you need a bit higher study than NCERT.
Here is link which can give you chapterwise weightage of all the topics -
https://medicine.careers360.com/articles/neet-chapter-wise-weightage-and-important-topics 
Also for important books refer the following link - https://medicine.careers360.com/articles/best-books-for-neet 

Hope this helps
Thanks!!