I don't think we did. The title doesn't sound familiar, which, admittedly, isn't saying much, as I would know the German title anyway, but there isn't a German Wiki page, either.

I would actually love to read a good boarding school story targeted at older readers. St Clare's & Co. are nice enough, but neither the characters nor the plot are terribly complex. The only "adult" boarding school novel that leaps to mind it The Confusions of Young Törless, but surely there must be more!