Firstly you need to make a smart and programmatic study schedule which you will follow throughout your preparation. Before starting your preparation, go through the whole syallbus. Clear all your doubts. Know the chapter wise weightage. If possible, make your own notes. Write down all the formula in a notebook so that you can access it whenever needed. Solve previous years papers, give mock tests. This will help you to clear your concepts. Study best books.
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No doubt, NCERTs of class 11 and 12 are the best book for Preparation. Start your preparation with NCERTs. Complete the entire book as many questions are directly asked from NCERTs.
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You can rely on Objective Mathematics by RD Sharma Sir.
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Play with Graphs by Amit M Agarwal (Arihant Publications)
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Differential Calculus by Amit M Agarwal (Arihant Publications)
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Complete mathematics for JEE Main TMH
Some must do topics are Co Ordinate Geometry, Limits, Continuity, Differentiability, Integral Calculus, Complex numbers and Quadratic Equation, Vector Algebra, Statistics and Probability, Three Dimensional Geometry etc. To help you with your preparation in Jee Main, Careers360 has come up with Jee Main Knockout package
http://learn.careers360.com/knockout-jee-main-april/