For comparison, my Canadian high school offered a "Teach Yourself C++ in 30 Days" book that you could study for up to 10 hours in the optional Computers course. If you chose that module, by the end of the first class, you would be more knowledgeable on the subject than any teacher in the school.
(It was actually an excellent school; they just did not care about computing. Nevertheless, I'm quite jealous of those kids with such an interesting option available to them.)
Also when I was in high school in Canada in about 2001-2003, I ended up taking over the class and teaching C++ because I’d already learned enough of it in my spare time that knew it better than the teacher (he liked Pascal better).
(It was actually an excellent school; they just did not care about computing. Nevertheless, I'm quite jealous of those kids with such an interesting option available to them.)