hi tejas, i can tell you where more weightage was emphasized last year, but do keep in mind that it could change

Physics: Mechanics is the most important topic. 12-13 questions were asked on it last time.

Chemistry: Organic Chemistry dominates the chemistry question paper. 14-15 questions were from topics related to it.

Biology: There was a more uniform distribution of questions in Biology. There was no single unit or topic from which more than 6 questions were asked. Hence it would be wrong to deem any one single chapter most important as all are important.

This is quite difficult to tell the class wise topic's weightage but generally below topics are considered to be important so it is advisable to prepare them all properly -

Biology -

Principles of Inheritance and Variation

Cell - The Unit of Life

Biological Classification

Morphology of Flowering Plants

Sexual Reproduction in Flowering Plants

Ecosystem

Plant Kingdom

Human Health and Disease

Human Reproduction

Environmental Issues

Chemical Coordination and Integration

Digestion and Absorption

Physics -

Ray Optics

Electrostatics

Semiconductors and Communication System

Photoelectric Effect and Electromagnetic Waves

Rotational Motion

Current Electricity

Laws of Thermodynamics

Waves and Sound

Electromagnetic Induction and Alternating Current

Magnetic Effects of Current

Chemistry -

Chemical Bonding and Molecular Structure

General Organic Chemistry

p Block Elements

Alkanes, Alkenes and Alkynes (Hydrocarbons)

Atomic Structure

Carbonyl Compounds (Aldehydes and Ketones)

Classification of Elements and Periodicity in Properties

Solutions and Colligative Properties

Ionic Equilibrium

Chemical Thermodynamics

d and f Block Elements

Haloalkanes

Good Luck!!!