Hello,
To score good marks in JEE Mains you need to thoroughly go through the NCERT books. NCERT books are a must to clear your fundamentals. You can go for higher level books once you clear your fundamentals. But please note that NCERT books are not enough. You must apply the concepts in solving problems. You should go for higher concepts books. .here's a link for some of the best books for JEE mains. https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/best-books-for-jee-main/amp&ved=2ahUKEwiX-d-b-57qAhXKfn0KHQ3HA9kQFjAAegQIAhAC&usg=AOvVaw1wil8ti_ze9MSV-Wo_mLsd&ampcf=1

Here are some preparation strategy for jee mains.

• Prepare time we'll
• Know your syllabus thoroughly
• Study the genuine books recommended by experts
• Appear for frequent mock tests
• Practice previous year question papers
• Keep your mind and body healthy

You can join the Careers 360 online coaching for jee mains. It provides frequent mock tests, previous year question papers with solutions and doubt clearing. The price is also very low.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://learn.careers360.com/&ved=2ahUKEwjxlvaf-p7qAhXOR30KHYxKClAQFjABegQIBxAB&usg=AOvVaw1ygKzacnBaQOPGaLiWbSgF

Hope it helps

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