Hi Aspirant,
As per the syllabus of jee mains,the chapters are-

Mathematics-

Sets, relations and functions

Complex numbers and quadratic equations

Matrices and determinants

Mathematical reasoning

Mathematical induction

Permutations and combinations

Sequences and series

Limit, 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)

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

Try to go through these topics to have a chance to score the maximum marks.
Going by your desired result of 80 marks,even half of the topics will be good enough.
However,if you study anything,give your best towards it.
Hope this helps.

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