I is a hi skul gradjit

You paid attention during 100% of high school!

85-100% You must be an autodidact, because American high schools don't get scores that high! Good show, old chap!

Do you deserve your high school diploma?
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I don't know from what crevasse of my mind the formula for finding the area of a right triangle sprang (sprung? springed?), but spring it did, just at the last second.