Hello,







Though all the chapters are important but these are following chapters that are important for making a good base in class 12 :



Chemistry :



Chemical Bonding

Equilibrium

Basic Concepts of Organic Chemistry

Hydrocarbons

Physics :



Units and Vectors

Newton's Laws of Motion.

Work Energy Power

Rotational Dynamics

Waves and SHM

Mathematics :



Relations and Functions

Limits, continuity and differentiability

Trigonometry

Coordinate Geometry

Permutation and Combination

Binomial Theorem

Probability



I hope this helps.