Earlier quoted context omitted.
My personal experience is that it wasn't just hours. Those who liked math spent a lot of time on it after classes. Those who didn't, avoided extras and still did OK (they would not go to top universities, but the base would be OK, with some practice, if they decide to go to a mid-level school). The biggest difference for me in school was a consistent, well thought out program (one for the whole country) and books. A…
You’re describing an idea adjacent to “mastery” schooling; it’s the natural method people tend to use when self-taught; it’s also how some online schools, like Khan Academy, use to teach. Both of my kids earn “allowance” (extra screen time; robux; etc.) by doing Khan Academy courses. Watching how unevenly they pick up topics — there’s no rhyme-or-reason to the speed they pick up even “close” skills — makes me think t…
It's hard to understand the the connections between and motivations for concepts when you are learning everything about a topic before moving on. I prefer the style described above, of learning the basics then moving on and circling back when more advanced aspects are needed.
Clearly different styles work better for different people.