A very good evening to you !!

As per your query , JEE MAINS refers to joint entrance exam which is conducted for the students who have mathematics as a background. This is a national level of entrance exam which is conducted by NTA known as national test agency. The jee main exam 2023 will be conduct four times February, March, April and May. Now , come to the syllabus part so the whole syllabus of physics, chemistry and mathematics of classes 11th and 12th will come. So , if you want to know individual chapters then visit the given link :

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

I hope this will be helpful for you.

Good luck  !!