JoB, I think my middle school class started with BrE, after one or two years we switched officially to AmE (and the textbook's scenes now took place in the USA), and the last year was Australia and some Australian regional distinctions (though I have to admit I forgot about most of that).
Really? Back then we were told that it's Queen's English only because of decision of school administration (which means that it should've been the same at least across the state, NRW), if that's been changed, bonus points to the German school system. But as I said, it's not like my teachers were
able to carry out such a decision, anyway - except from the one hailing from
Malta I never got in
my classes. Every time we had a test, empty lined paper was handed out and the teacher would start dictating the standard header ... "please write on the right half of the first page ... Mumbleuary thirty-second
comma nineteenhundredumpteen ..."