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I wish there were better (or more known to me) quantitative tests of skills that are good for me to have. I often find learning things when there is tight feedback pretty fun. For instance, I play geography and history quizzes on Sporcle with an addictive vigor, and enjoy learning various languages on Duolingo, and various facts via Anki. I used to memorize poetry from the bathroom walls. But none of these seems that useful (in Anki I mostly learn about famous art and art movements). And meanwhi...