Feedback for learning

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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 meanwhile, I fail to know all manner of things that would be good to know, and forget most of what I read. (For instance, I’d like to know many more details of machine learning, how the US government works, and what happened in most of history, and I wish I remembered the details of The Precipice or The Better Angels of our Nature or even War and Peace—which I haven’t read much of, substantially because I keep losing track of what is going on or who the characters are.)

I feel like the situation was better in high school: there were contests and exams for all kinds of stuff that seemed decently useful, like math and chemistry. I guess one problem with my current situation is that because I learn things in a more distributed way, they don’t tend to come with a well matched test. A couple of times I have learned some math for instance, then looked for a suitable exam, but most exams don’t match the exact math that I learned. I suppose a solution might be to only learn things from places that also offer tests, but somehow this doesn’t sound great. Perhaps it is that the tests I found before didn’t seem that promising for rapid feedback anyway—you had to turn to a different page of a pdf or book and search through and check your own solutions. Imagine how much less fun Sporcle would be if instead of instantaneously responding to your touch, nothing happened until the end of a quiz, at which point it emailed you a pdf of the answers.

Some of this seems like it might have an easy solution that someone else knows about, at least for areas that are readily quantitatively examinable, such as math. So if I seem to be wrong, please correct me!

Do you know of well-gamified learning opportunities or tests for things that are worth studying?

I had fun practicing calibration of predictions, which seems useful, until the app idiosyncratically broke for my account in a permanent way. I also recently noticed the existence of Quantum Country, which apparently teaches about quantum mechanics via essays with built in spaced repetition, so I’m also excited to try that.