Basically the movie "Kai Po Che" was based on Chetan Bhagat's novel The 3 Mistakes of My Life.
Sushant Singh Rajput, Rajkummar Rao and Amit Sadh star as the three main protagonists while Amrita Puri plays the female lead.
In Kai Po Che, Ishaan (Sushant Singh Rajput) asked his friend Govind (Rajkummar Rao) to tutor his sister before her exams. In what subject did his sister weak?
Stammering when they were emotional