Hello,

Oswaal sample papers and question books are really a thing to consider when you're aiming high to secure good marks in examinations. They provide a vast range of previous year questions and also the questions which are most likely to be asked in the upcoming examinations.

But if you don't want to use them NCERT is always the best.The Central Board of Secondary Education (CBSE) uses the books designed by NCERT and the syllabus of JEE Mains is completely similar to the syllabus of CBSE (11th and 12th). This makes the NCERT books a perfect choice for the JEE Mains preparation.

Hope this helps!!!