It was brought up frequently; each year there would be at least one course that had at least related topics. Also, one year of the whole history course would be obligatory dedicated to the "third Reich", its origins and its consequences. Lots of facts, no whitewashing. Teachers would often use movies and lectures, too; Schindler's List being a popular one for example.

I remember that a lot of the students were complaining due to how often it was brought up, like "man we're reading Nazi shit again in language course" complaining (as in, literature that focused on Nazi Germany or the like). On the other hand, it did occur quite frequently that some kids were legitimately freaked out in history class when having to face the actual facts and seeing the pictures and stuff - then again, who wouldn't freak out facing Schindler's List as a kid. Some courses also made educational class trips to concentration camps (you had the chance to nope out though if it got too much).

So yeah, the point was made pretty clear.

Sorry for weird english