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<p>I don’t know much about the French system but I would guess the reason would come down to public school funding. In the European country where I reside, and I presume in France as well, all public schools are funded nationally and basically equally per student. Teachers who are certified nationally, after a fairly difficult exam, are sent to where they are needed (their preferences are considered within a point system based mainly on seniority). Therefore, where you live locally is not such a factor in the quality of education, although obviously family culture and socio-economic status will still play a role.</p>