Hello
JEE Main lasts three hours and consists of 90 multiple-choice questions. The exam consists of three sections: Physics, Chemistry, and Mathematics. Each section contains 30 questions. All sections are weighed equally.
You can go through the link below and check the JEE Main syllabus with chapter/topic wise weightage

https://engineering.careers360.com/articles/jee-main-syllabus-weightage

Good Luck!

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