Mohit Bhargava (MB Sir) first rule is:- Leave Physics apart, first use your Common sense. He is also known as Jugaad Sir. He is the most intelligent teacher that I have come across. Despite being a Physics tutor, each year, he solves all the calculus problems in one go in the simplest way, just for his own satisfaction.
He made us solve Irodov (the toughest book of Physics for IIT aspirants) in a very simple manner and some questions even without using any concept of Physics. He taught us the concept rather than formulae.