I have studied for CA Final from Dippak Gupta sir and he was the best teacher that I could have for my IDT classes. Now after becoming a CA and after starting my own practice, I still look forward to sir's new books and question banks release because all the charts and explanations make it very easy to understand all amendments and concepts easily. I am still a regular buyer of sir's class textbooks, both of GST and Customs to update my GST knowledge for every year.