Hello,
Do not worry, here is the link for JEE main 2020 syllabus which is helpful for you go through it
https://engineering.careers360.com/articles/jee-main-syllabus/amp
Prepare a timetable to study.Start studying the important chapters first.Grasp the content and understand the concepts.Prepare short notes.Solve problem related to the concepts you have studied so that you will understand how to solve the problems.Practice as many questions as possible to increase your revise each topic when you complete whole chapter.Try to remember formulas.Keep a track of your performance and improve your speed.Take help of your teachers and friends regarding doubts.Try to discuss with them.Rectify your mistakes.Give as many mock tests as you can they will help you alot and solve previous years question papers.Stay motivated and aim bigger.

I hope this is helpful to you.