Which is most important chapter for Jee main and advanced and what books I have to buy???
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Directly it will be difficult for anyone to tell the important chapter because in these type of prestigious examination almost all chapter play a vital role a well few topics like parabola , hyperbola , ellipse 3D Geometry these are some topics of Mathematics and for other subjects you have to look through the weightage of other topics. You have to buy books like NCERT , SL Arora , HC V , RD Sharma , Arihant , I.E IRODOV etc are few good books.
Good luck
Because you will see that from last years papers that cbse ask questions from all chapters.
And for Jee advance
https://www.quora.com/What-are-the-most-important-topics-for-the-JEE-Advanced
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important chapter for JEE advanced
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