I think this is a bit of a problem at school, not only for this teacher, but also for other teachers, that they feel that they always have to know everything. I don't think a teacher should always know everything, that he can easily admit that he doesn't know something. Especially in a selective high school, because I think it's worse when students find out and find out that the teacher didn't know and came up with something.
I don't think a teacher should always know everything, that he can easily admit that he doesn't know something.