(Czech Republic) I took one in high school, it was optional and paid, but sort of organized by the school. I think we took it instead of some morning classes. I

(Czech Republic) I took one in high school, it was optional and paid, but sort of organized by the school. I think we took it instead of some morning classes. I got an official-looking Mensa application form attached to the results, so I think it was pretty legit. (never applied though)