On holiday a few years ago, we met a lovely German family with children similar ages to our own. We have since exchanged letters and cards a couple of times a year. Their recent Christmas letter broached the possibility of an extended 9 month exchange for their 14 year old with our almost 15 year old during the next academic year as if it were a perfectly normal thing to suggest.
My DD was horrified at the idea, mainly for social and emotional reasons - but the fact that next year is GCSE year for her (and she's not studying German!) really rules it out anyway.
I can't imagine any 14 year old who would want to leave friends and family for a strange family for such a long period - would they?
Is it more normal in Germany and how does the German education system work around it? Even with schooling in the foreign country / language, it would surely be a huge amount to miss from your native curriculum?