By doing a very detailed due dilligence of schools in Bavaria, the rest of Germany, Austria, France and Sweden, using the most advanced data science methodologies, including all available for money social studies as summarized by Chat-GPT (which reminds to run that again now that version 4 is out) and having the results put into a picture drawn by Dall-E and vetted by the social science PhD I met as my taxi driver (I don't take Ubers).