hello aspirant,

I dont think just going through ncert would help you fetch a good rank in jee.if you doubt you can check yourself through previous year question papers after completing the syllabus.also while preparing simultaneously you willbe giving the mocks and you will understand.ncert books help in the basics concept understanding.though few percent of chemistry questions relating to theory part maybe directly from ncert but not most of them are from ncert and for a good rank you need to attempt most of them to be correct.if you expose yourself to various type of questions answering jee questions would be easy.also previous year question are much helpful to understand the level of questions and solving similar type and range of questions.give as many as mocks as possible and be clear with concepts.reference books help but i advice you not to go through all of them at once.pick those wisely or pick one with the help of your lecturer and solve all of the questions from it.

for more information regarding reference books refer to: https://engineering.careers360.com/articles/best-books-for-jee-main

hope this helps,

thankyou.