Yes, Math Academy does exactly this. They have a graph of topiv (in small-sized chunks). Each topic has a lesson with exercises and reviews (based on spaced rep

Yes, Math Academy does exactly this. They have a graph of topiv (in small-sized chunks). Each topic has a lesson with exercises and reviews (based on spaced repetition). It's hard to understand how well it works until you've tried it yourself for a couple of weeks. Also it assumes you'll study at least a few times per week.