At the risk of sounding kind of like a fanboy, you should check out Math Academy. That thing is very good, is based on actual research, they have a book explain

At the risk of sounding kind of like a fanboy, you should check out Math Academy. That thing is very good, is based on actual research, they have a book explaining their approach - https://www.justinmath.com/files/the-math-academy-way.pdf https://www.justinmath.com/files/the-math-academy-way.pdf And it is conceived for kids and they routinely seem to take smart kids and enable them to learn advanced math. I think you are correct that individual instruction is still necessary and just passive consumption of content is not the way. But there are solution that make the system much much more efficient.