Grade 13 (yes, we had that in Canada back when I was in school) Calc, Trig, Advanced Functions and Relations. And let''s not forget Geometry and Discrete Math.
I got pretty good at them and can still manage to solve the occasional problem that my 18 year old nephew throws at me.
P.S.
Back on the subject of ''crazy things we''ve all done'', I once did a crossword puzzle in ink.
OOPS! Forgot the ''n'' in Functions. That was nearly a disaster.
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