Hii!
All the topics in all the three subjects i.e., physics, chemistry and Maths are important. You can't leave a topic thinking it's not important. What you can do is check out the weightage of each topic or chapter in the exam as per the previous year question paper trends. The link given below will help you get an idea of the weightage of topics in all the three subjects. Then, you can prepare accordingly-
https://engineering.careers360.com/articles/jee-main-syllabus-weightage/amp
Hope this helps.
Good luck!

Hello student each and every topic is important you should not skip any chapter or topic in search of important topic because you can't predict from which topics question will come or not its totally unpredictable.
Some of the important topics are mentioned below  Mathematics -1) Differential Equation
2)Differentiation
3)Trigonometry Equation
4)Statistics
5)Mathematical logic
6)Sets and Relation

Chemistry
1)Atomic Structure
2)Chemical Bonding
3)Gaseous and liquid state
4)Chemical Kinetics
5)electrochemistry

For more updates refer to the link mentioned below - https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-important-topics-books/amp

Feel free to comment if you have any doubt
Good luck

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