Hi Prashant
First of all NCERT is must for jee 2020 as you can many questions are directly from NCERT in 2019 especially in chemistry
Some important topic for jee are
Chemistry
Environmental chemistry
Chemistry in every day life
Biomolecules
Alcohol
In inorganic most of the question are from chemical bonding
Mathematics
Coordinate geometry
Quadratic equations
Sequence and series
Probability
Vector and 3D geometry
Physics
Modern physics
Thermodynamics

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