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The heaviest, roughly in order: Modern Physics (photoelectric effect, atoms, nuclei, semiconductors) and Electrodynamics (current electricity, magnetism, EMI, AC) together tend to account for close to 40-45% of the Physics section. Mechanics (kinematics, laws of motion, work-energy, rotational motion) is the next big block, around 30%. Optics and Waves are moderate. 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Practical takeaway: weakness in Integral Calculus is the most costly possible weak spot in Maths — it is both high-weight and foundational, so it should be fixed before lower-weight areas.", "sources": "NTA JEE Main weightage tables, Cengage Maths preface." }, { "id": "ch_chem", "enabled": true, "title": "Chemistry — three lanes, priced differently", "synthesis": "Physical Chemistry (thermo, equilibrium, electrochemistry) is the largest high-yield lane; Ionic Equilibrium and Electrochemistry are high-return, so a stale/untouched status there is avoidable mark loss.", "body": "Chemistry splits into Physical, Inorganic, and Organic, and they don't carry equal marks. Physical Chemistry (thermodynamics, equilibrium, electrochemistry, solutions, kinetics) is numeric and high-yield, typically the largest lane. Organic is close behind and very scoring once mechanisms are solid. Inorganic is more memory-heavy and streaky. 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