For chemistry which guide is best for Jee main and advanced
Hii Arun...For jee main Ncert is the best one you need to have. And for jee advanced with the basics of the ncert you need to solve many problems. M.S Chauhan for organic chemistry and O.P tandon for physical and inorganic. Happy Learning. Hope this helps you.

Hey, the best book for chemistry preparation as per recommended by the IITians is the book of organic chemistry by O.P. tandon.It covers almost all the aspects of the syllabus of JEE MAINS. And for the some uncovered portion, you must go through the NCERT chemistry book of class 11 and 12 .
Best regards:)
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