[lolinder]

> you need a short feedback loop to decide if you're doing it well or not

This is crucial. Without a short feedback loop you're not practicing, you're just doing take home quizzes.

The best teachers that I had would assign only odd-numbered problems as homework so you could check your work in the back of the book. In classes where they didn't do that, I usually "cheated" by plugging the problem into Wolfram Alpha or similar, because I knew that learning what I did wrong after we'd already moved on to the next unit would be pointless.