Hello,

The important chapters of each section is given below

Physics

• Wave Motion 5%
• Nuclear Physics 5%
• Solids & Semiconductor Devices 5%
• Modern Physics – Atomic Models 5%
• Laws of Motion 4%
• Rotational Motion 4%
• Current Electricity  7%
• Heat and Thermodynamics 6%
• Electrostatics 6%
• Magnetic Effects of Current and Magmatism 6%
• Work Energy Power 5%
• Simple Harmonic Motion 5%
  Physics of Nucleolus 5%

Maths

• Vectors    7%
• Probability    7%
• 3-D Geometry    6%
• Limits    5%
• Matrices & Determinants    5%
• Definite Integration    5%
• Theory of Equations    5%
• Sets, Relation & Functions    5%
• Indefinite Integration    4%
• Complex Numbers    4%
• Permutation & Combination    4%

Chemistry

• p-Block Elements    6%
• Redox Reactions    5%
• Ionic Equilibrium    4%
• Chemical Equilibrium    4%
• Coordination Compounds    4%
• Carboxylic Acids & Derivatives    4%
• Alcohol, Phenol & Ethers    4%
• Chemical Thermodynamics    4%

Go through the given link for reference

https://engineering.careers360.com/articles/wbjee-preparation-tips

Hope it helped

GOOD LUCK!!