Hello student you can start preparing for Jee main at the beginning of class 11.
Prefer NCERT to build your basic concept and make sure you do each and every example and exercise questions of Ncert before jumping to a reference book after completing ncert thoroughly refer to your coaching material or any reference book as mentioned below.

Concept of physics by HC VERMA
OP TONDON CHEMISTRY
Rd Sharma Mathematics
Arihant practice book for Jee main.

You can also subscribe to careers360 knockout package for preparing and qualifying the entrance examination, refer to the link mentioned below - https://learn.careers360.com/knockout-jee-main-april/

Feel free to comment if you have any doubt
Good luck

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