JEE Main 2020 syllabus:

Mathematics:

Complex numbers and quadratic equations,Matrices and determinants,Sets, relations and functions,Mathematical induction,Permutations and combinations,Mathematical reasoning,Limit, continuity and differentiabilitIntegral calculusThree-dimensional geometry,Differential equations,Binomial theorem and its simple applications,Sequences and series,Vector algebra,Statistics and probability,Trigonometry,Co-ordinate geometry.

Physics:

Physics and measurement,Rotational motion,Thermodynamics,Kinematics,Work, energy and power,Properties of solids and liquids,Gravitation,Laws of motion,Oscillations and waves,Electronic devices,Kinetic theory of gases,Current electricity,Communication systems,Electromagnetic induction and alternating currents,Magnetic effects of current and magnetism,Optics,Electromagnetic waves,Atoms and nuclei,Electrostatics,Dual nature of matter and radiation

Chemistry:

Physical Chemistry: basic concepts in chemistry,States of matter,Atomic structure,Chemical bonding and molecular structure,Chemical thermodynamics,Solutions,Equilibrium,Redox reactions and electrochemistry,Chemical kinetics,Surface chemistry,Organic Chemistry,Purification and characterisation of organic compounds,Hydrocarbons,Chemistry in everyday life,Principles related to practical chemistry,Organic compounds containing halogens,Organic compounds containing oxygen,Organic compounds containing nitrogen,Polymers,Some basic principles of organic chemistry,Biomolecules,Inorganic Chemistry:Classification of elements and periodicity in properties,Hydrogen,Block elements (alkali and alkaline earth metals),P Block elements group 13 to group 18 elements,d- and f - block elements,Co-ordination compounds,Environmental chemistry,General principles and processes of isolation of metals

Hello there. Hope you are doing good. I would like to share the link with you which consists of syllabus of Physics, Chemistry and Mathematics. You can also get additional details regarding JEE MAINS in that link.

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

I hope you found this answer helpful. Good luck for your future.