Hello,
Jee main and advanced syllabus is NCERT physics, chemistry and mathematics. It is same every year. There might be some changes in next year but it is undetermined from now.
For now you can prepare NCERT and other reference books for physics chemistry and mathematics. NTA provides mock test. You can use them to check your performance.
For more information visit the official webpage of the NTA board.
Hope it helps!

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