I just looked through some "Bildungsserver" (information offered by ministry of education) to find a list of calculators allowed at schools. What I found are links to three "market companions" of HP, one of them showing a list in which county which of his models is allowed at what school. Nothing from HP.
And then this http://www.landeswettbewerb-mathematik.de
Anybody here who knows which HP calcs are allowed in which school? Seems to be an issue to find out.
Ciao.....Mike