Note-per-time

The time you spent learning for a test divided by the grade you get. It is something extremely stupid thought of by an extremely stupid person

Person: Dude, i got an A for Maths!
Smart person: That's cool, i got a B
Person: So i'm smarter than you!
Smart person: no, actually. You studied for 8 hours in total and got an A, while i studied 1 hour to get a B, which means my note-per-time is better.
Person: shut the fuck up