Hello aspirant,

Within 20 days.......Yes, it is possible to clear the JEE mains exam within 20 days, providing that you must have cleared down with all the basics of class 11th and class 12th and also you are familiar with the JEE mains question pattern. JEE mains is not a very easy examination. It requires extreme effort, grit and hard work to clear this examination with consistent effort adn practice. So, you can clear the examination if you have all the concepts, basics and  important chapters of both class 11th and 12th have been cleared.

Further, I would like to share with you some of the best preparation tips and strategies that if you follow would help you to fetch some good scores and rank in JEE mains examination :

Know your JEE Main syllabus 2022.

Understand the exam pattern of JEE Main 2022 exam.

Make the JEE Main 2022 preparation plan.

Books to refer : TO refer for best books for JEE mains follow the below mentioned link : https://engineering.careers360.com/articles/how-prepare-for-jee-main

Practice till you are perfect using mock tests and JEE Main previous year papers.

Further, to know further details and preparation for JEE mains exam follow the below mentioned link :

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

Further, below are some of the Important JEE Main Books for Mathematics

Trigonometry by S. L. Loney

Higher Algebra by Hall & Knight

Maths XI & XII by NCERT

Coordinate Geometry by S. L. Loney

Problems in Calculus of One Variable by I.A. Maron

JEE Main Books for Physics

Problems in General Physics by I.E. Irodov

Fundamentals of Physics by Halliday, Resnick & Walker

Concepts of Physics Vol I and II by H.C. Verma

Books for JEE Main Chemistry

Organic Chemistry by Paula Bruice Yurkanis

Organic Chemistry by Morrison & Boyd

Inorganic Chemistry by J.D. Lee

Numerical Chemistry by P. Bahadur

Further, For more information and complete details about the JEE mains tips and strategies and about the subject wise weightage in JEE mains, you can follow the belwo link :

https://engineering.careers360.com/articles/jee-main-preparation-tips

I hope that this will help.