Dear aspirant hope you are doing well...

You can check out the rank v/s marks for jee main exam. You can check out the link below....

https://engineering.careers360.com/articles/jee-main-marks-vs-ran

Preparation tips for jee main exam..

Go through the syllabus of jee main https://engineering.careers360.com/articles/jee-main-syllabus/amp

Make a time table..

Make short notes of important topic.

Practice mock test. https://learn.careers360.com/test-series-jee-main-free-mock-test/

Do revision on regular basis.

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https://learn.careers360.com/knockout-jee-main-april/

Jee main complete detailed information are given. Click on the link below

https://engineering.careers360.com/exams/jee-main

Hope it's helpful thank you