I self-taught basic algebra with a "choose your own adventure" book that advanced to the next topic for correct answers and went through pages explaining the co

I self-taught basic algebra with a "choose your own adventure" book that advanced to the next topic for correct answers and went through pages explaining the common misconceptions then returned to the question for incorrect. (to be fair, class sizes were ~30 when was in school, so asking the learner about their understanding and correcting misunderstandings would not have been likely: assuming 40 minutes lecture time for a 50 minute class, that's 20 seconds per student, and at most ~2 minutes if no lecture time whatsoever)