You can check the below detail -
Mathematics
Sets, relations and functions
Complex numbers and quadratic equations
Matrices and determinants
Mathematical reasoning
Mathematical induction
Permutations and combinations
Sequences and series
Lbw, continuity and differentiability
Integral calculus
Differential equations
Binomial theorem and its simple applications
Three dimensional geometry
Vector algebra
Co-ordinate geometry
Statistics and probability
Trigonometry

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

Chemistry -
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


Hope this helps!!!!

Below are the important chapters with high weightage of JEE Main you can check-

 

Physics

Mechanics

Electricity and magnetism

Thermal physics

Fluids and waves and sound

Potentiometer-related experiments

Optics

Modern physics

 

Chemistry

Physical Chemistry-  Mole Concept,Atomic Structure

Organic Chemistry- General Organic Chemistry, Named Reactions

Inorganic Chemistry

 

Mathematics

Calculus

Co-ordinate Geometry

Vectors (and 3D Geometry)

Algebra

Trigonometry

 

To check the coplete syllabus you can refer below link

JEE Main Syllabus 2018

 

Good Luck!!

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