Dear Aspirant,

The best way to prepare for JEE is to start preparing from atleast one standard book of the subject along with a coaching material of some good coaching institute.

In this way you'll cover almost all of the syllabus and also with the correct proportion for those topics as per JEE main exam. This is because the coaching material is designed in such a way. You can go for coaching material of ALLEN, Resonance, Akash, FIIT-JEE, etc.

They all have a very good material. You could use help books and NCERT textbooks also. Never slip NCERT Books as they have a lot of content which comeS directly as questions in JEE main exam especially.

You could also check out following links:

https://engineering.careers360.com/articles/how-prepare-for-jee-main/amp

Hope this helps. Thank you.