syllabus of JEE main physics chemistry mathematics
The syllabus for JEE main covers all the topics from NCERT class 11th and 12th and the detailed syllabus can be found by visiting the link given below
https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-syllabus/amp
for better understanding of the topics which are important for JEE main exam you can refer to the previous years questions.