Hi
In Jee mains exam core subjects Like chemistry mathematics physics are always there.
No matter its your first paper or second the pattern of examination will not change.
Its always better to give mock exams to have a more clearer picture of exam pattern .As this paper is not that easy to crack so one should always be very familiar with the core subjects.
Yo further understand the pattern and syllabus follow the link
https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/jee-main-syllabus/amp&ved=2ahUKEwioubqZ-YfxAhXUX3wKHSWVA8YQtwIwAHoECAMQAg&usg=AOvVaw3dJoT3-VcydpEQD8beQpzY&ampcf=1

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