Hello,

The chapters which have high weightage and most important are:

Mathematics:

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

Physics:

• Rotational Motion
• Thermodynamics
• SHM
• Electrostatics
• Magnetism
• Optics
• Modern Physics

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 better preparation you need to solve the previous year question papers as well. You can get the question papers from the link below

https://engineering.careers360.com/articles/jee-main-question-papers

Good luck!