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Even after reaching at this point as a Dr, I still use concepts taught by Ravi sir, he is probably one of the best if not the best chemistry teacher in the world.made Boards 2018 a cakewalk.
Ravi Sir is best in Chemistry. I even got a merit certificate from CBSE for being in top 0.1% in Chemistry in my XII board exams (2011). He is a absolute gem.