There is an IB-course on a gymnasium level here in town, and, well, I can't really determine why anyone would want to go there in the first case (and then half of the girls in my 9th grade class went to IB... ). First of all, it's not especially compatible with the Swedish educational system, which inevitably causes some problems when you proceede to the university, and all the education except the Swedish classes is in English, which in itself isn't bad, but at the time they graduate, their Swedish have actually gotten worse. No, I'll stick to my NV ("Naturvetenskap", or "Natural Science" in English) with extra English and the best English teacher in town.
Perhaps it's Roman numbers and x stands for 10.