Vrindaban, Mathura 
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Sagar sir has been an excellent teacher that taught me physical chemistry back in 2013 when I was preparing for my own JEE entrance exam prior my admission into IIT Madras. I still vividly remember learning was so much fun and easy when it came to his physical chemistry classes, they just made so much more sense that I still remember how he helped me visualize an octahedral void in two ways as a 3 + 3 atom staggered packing or a 1+4+1 stacking. I can solve the thermochemistry problems with the convention techniques he taught me, even at right this moment after 7 years so I leave it to your imagination how nicely he must have taught me this that I feel grateful to him and glad to leave a review when I came across his profile this evening. So good luck to you I bet you won't be disappointed learning from him.
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