Hello Sai,

All the concepts are important as they are asked in one way or other. Still, some topics have more weight as compared to others. These are:

Chemistry - Stereochemistry, Chemical Kinetics, Equilibrium, Redox Reactions, Alcohols, Ketones, Carboxylic acids, and their reactions, hydrocarbons solid states.

Physics - Rotation, mechanics, modern physics.

Mathematics - Conic Section, Calculus, Vectors, Probability.