Hello Aspirant, hope you are doing good.

Classical physics is the physics of everyday phenomena of nature, those we can observe with our unaided senses. It deals primarily with mass, force and motion. Physics that does not make use of quantum mechanics or the theory of relativity. Newtonian mechanics, thermodynamics, and Maxwell's theory of electromagnetism are all examples of classical physics.

Yes , classical physics is in the syllabus of JEE.

For more information can visit the link given below:

https://engineering.careers360.com/articles/jee-main-physics-syllabus

Hope this information helps you.

All the best.