In Nazi Germany, how fast / effective was the spread of ideology and propaganda into education?

I've had a look through the sub and though there's a few different ones about "what was it like in the Reich for normal Germans?" and such, but one question I've wondered is how / when the rhetoric became standard fare in things like primary and secondary education?

Obviously you've got things like the Hitler Youth and BDM, which from what I understand started off as social / sporting club and then became a mandatory propaganda tool for boys and girls, but at what point did Hans go to school studying biology and history and science, and the next day was learning about Aryan purity, the Germans as ubermensch, and the great plans and benevolence of the Fuhrer?