How far does the effect of schools (any type) go?

How far does the effect of schools (any type) go? - Free stock photo of adult, back to school, backpack

I'm wondering how far the effect schools ahve goes (areawise). The first few attempts where I placed schools I had to put quite a lot within 1 "map cell" so that I get almost all people educated. Is there something I did do wrong or do schools (normally) have quite a large area of effect (and if so about how large)?

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