Navin sir has been an Excellent teacher. The best thing about his teaching is that you can ask any question as many times as you want till you understand it completely and he teaches everytime the same question with patience.
His motivation and inspiring words has always been my strength to practice mathematics, without his solutions I would not have been able to overcome my fear of solving the typical problems of this subject.
I have been to many coachings but his coaching is the best among all.