JEE Main is held in two sessions each year, and strong scorers go on to JEE Advanced for the IITs. Most candidates prepare for Class 12 boards at the same time.

Learn each chapter once, deeply

Study a chapter for boards first, then immediately solve JEE-level problems from the same chapter. You avoid revising everything twice.

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Mechanics and electrostatics carry a lot of weight. Get them solid early. (Kevin)

Mock tests and analysis

Take full mock tests in the final months, then spend as long analysing mistakes as you spent sitting the test.