I want to become IPhO and IIT-JEE topper. Which book to follow? Please SOLVE MY PROBLEM?

Feynman Lectures in Physics is indeed the best physics book I have ever seen. He is regarded as the best academician of the century. Even in our 1st year physics course in IIT Kharagpur our teacher recommended it to us. As for problem solving, you should follow 200 puzzling physics problems by Peter Gnadig , Aptitude Test in Physics by S.S. Krotov and also solve the past years Physics Olympiad papers. All coaching institutes and teachers will ask you to solve H.C. Verma (filled with the most standard (read boring) problems, that too suspiciously same as in the book Physics for Scientists and Engineers by Paul A. Tipler) as well as Arihant (which is undoubtedly a good problem book, but has BLATANTLY copied from the two books I mentioned). You should also check out Introduction to Classical Mechanics with Problems and Solutions by David Morin (Lecturer on Physics; Associate Director of Undergraduate Studies, Harvard University). Best of luck