"Your boat is now white. That's the sign of having passed your final exam and become a Prima Undine."

He doesn't have to phrase that in the form of a question, because he read it in a book and he remembers things he reads.

(Which is not the real problem when people are trying to get him to remember things. It's getting him to actually consider them important enough to bother reading about them that's the problem.)

"And if you didn't know: I don't sleep till very late."