For JEE Main, focusing on key chapters and topics from Physics, Chemistry, and Mathematics is crucial for effective preparation. Here’s a summary of the most important chapters and topics, along with some frequently asked questions (PYQs) that are often seen in the exam:

Physics :

1. Electrodynamics : Current Electricity, Electrostatics, and Magnetic Effects of Current.

   • PYQs : Ohm’s Law, Kirchhoff’s Laws, and Magnetic Field due to Current.

2. Mechanics : Kinematics, Laws of Motion, Work, Energy, and Power.

   • PYQs : Projectile Motion, Newton’s Laws, and Conservation of Momentum.

3. Optics : Ray Optics and Wave Optics.

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   • PYQs : Lens Formula, Mirror Formula, and Interference of Light.

4. Thermodynamics : Laws of Thermodynamics, Kinetic Theory of Gases.

   • PYQs : Carnot Engine Efficiency, Entropy, and Heat Engines.

Chemistry :

1. Physical Chemistry : Chemical Kinetics, Thermodynamics, and Equilibrium.

   • PYQs : Rate Laws, Le Chatelier’s Principle, and Arrhenius Equation.

2. Inorganic Chemistry : Periodic Table, Coordination Compounds.

   • PYQs : Trends in the Periodic Table, Coordination Numbers.

3. Organic Chemistry : Hydrocarbons, Functional Groups, and Reaction Mechanisms.

   • PYQs : Nomenclature, Reactions of Alkanes, Alkenes, and Alcohols.

Mathematics :

1. Calculus : Limits, Differentiation, Integration.

   • PYQs : Derivatives, Integration Techniques, and Area under Curves.

2. Algebra : Quadratic Equations, Complex Numbers.

   • PYQs : Roots of Quadratic Equations, Properties of Complex Numbers.

3. Coordinate Geometry : Straight Lines, Conic Sections.

   • PYQs : Equations of Lines, Parabolas, Circles, and Ellipses.

4. Trigonometry : Trigonometric Functions, Identities.

   • PYQs : Trigonometric Ratios, Solutions of Triangles.

Focusing on these chapters and practicing past year questions will help you understand the pattern and difficulty level of JEE Main.