I did the ISCZ 4 Saturdays 09:30-15:00, with the SSS at Flumserberg (who are the international school?). Our instructor was great, but there was a lot of fannying about waiting for people who were late, had problems with there hire kit etc. I would question now if it's worth it so late in the season, as by the time a beginer gets a little confidence the season is all but over.