You can prepare according to JEE Main syllabus.

Below are the topics for JEE Main Chemistry you can check

Physical Chemistry

Some 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)

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

Good Luck!!