Hello student yes Jee main syllabus is available it cover the whole syllabus of class 11 and 12 of Physics Chemistry and Mathematics Subjects.
Prefer NCERT to build your basic concept and make sure you do each and every example and exercise and exercise questions of Ncert before jumping to a reference book.

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

Feel free to comment if you have any doubt
Good luck

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