Looks like Chetan Bhagat wrote 5 Point Someone and then forgot the story.
(That we did too is another matter entirely)
For if the author is to be believed, then from now on those who have studied in engineering colleges, have fallen in love with professors' daughters, had to deal with nasty profs, tried flicking question papers, etc had better not write about it or make films on it.
Those were the only similarities I could find between the book and the movie 3 Idiots. Oh, and that the professor's son killed himself cos he didn't clear his exams and the prof thought it was an accident. (So next time any of you wanna kill yourselves, here's the deterrent: you'll have to pay royalty to Chetan Bhagat.) I still haven't figured out why the filmmakers have bothered to mention the author's name at all.
And Mr Bhagat wants more credit? Ha!
PS. A supposed Chetan Bhagat die-hard fan insisted: "oh the movie is much better than the book. I watched it thrice."
PPS. The movie rocks.