what should I do to get top10 rank in jee advanced if I start preperation from 4th July for jee advanced 2021?

Hello student you need to practice alot to secure a good rank like under 10 as practice is the only key to get command over conceptual problems. Practice as much as possible so that you can solve conceptual problems easily in examination.
Solve 5 previous year question paper so that you can get an overview of your weak and strong areas.
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
You can also subscribe to careers360 knockout package for preparing and qualifying the entrance examination, it offer you 100 percent money back guarantee if you do not qualify.
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