What percentage of friends are made throughout school?

i heard somewhere that it was 31.7% so that's the best i can tell u

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Ignoring the silly fraction, that's probably the best anyone could say because the question does not consider the natures and durations of post-school friendships. If I and my friends and acquaintances, both at school and met much later, are a guide, once many people leave school they disperse within a few years to further education, work, marriage etc. often far from their childhood locations. Although some indeed stay friends for many years later most lose touch with each other even when still living geographically near. Our lives change, and with it we lose whatever bound us as friends in our teens. That does not mean we fall out. We simply drift apart.