Harry Potter and the Prisoner of Azkaban
They sat and made notes on werewolves from the textbook, while Snape prowled up and down the rows of desks, examining the work they had been doing with Professor Lupin.
"Very poorly explained [...] That is incorrect, the kappa is more commonly found in Mongolia [...] Professor Lupin gave this eight out of ten? I wouldn't have given it a three [...]" (9.4.36-7)
"You're expecting too much of yourself," said Professor Lupin sternly in their fourth week of practice. "For a thirteen-year-old wizard, even an indistinct Patronus is a huge achievement. You aren't passing out anymore are you?" (12.5.4)