Every person in your world attends a school until they're eighteen?

[While continuing one's education for most of one's life was the norm for a mage, schooling for everyone until eighteen years was not common as far as he knew. Perhaps for the Nobles, but not far the common man. Certainly not for most city elves. What schooling they got was from their parents and the Chantry Sisters that reached out to those in the Alienage.]

Even if they don't have the means to attend the same school as you, they do still attend a school?