Dear student,
To score above 250 you cannot forget the topics from class 11th as they also have a huge weightage in jee mains. Therefore I am listing the topics of both 11th and 12th class that are important and have a higher weightage in jee mains as compared to others.
Physics

Rotational Motion
Thermodynamics
SHM
Electrostatics
Magnetism
Optics
Modern Physics

Mathematics

Complex Number
Conic Section
Circle
Calculus
Vector & 3 D
Probability
Trigonometric Equation
Properties of Triangles
Quadratic Equation
Sequence and Series
Permutations and combination

Chemistry

Chemical bonding
Electrochemistry
Coordination compound
Salt analysis
Ionic equilibrium
Thermodynamics & thermochemistry
Aldehydes and ketones
Aromatic hydrocarbons
GOC isomerism
Liquid solutions
Alkyl halides and aryl halides

For more info you can visit the following link:
https://engineering.careers360.com/articles/most-important-chapters-of-jee-main

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