[koenneker]

Have you looked into Montessori schools[1]?

I had the great pleasure of visiting a school based on that model and it allowed a lot of flexibility for students. In my instance there were 4+ hours of "Free-work" blocks everyday, where we could work on whatever we wanted, we just had to make sure we finished certain (personalised) workloads by the end of the week. Pacing and what we wanted to do with our time if we finished early was up to us as a student and we could work on more advanced topics. Students were also encouraged to ask older members of the mixed age class if we got stuck, which made most students quite good at explaining topics to each other while giving older or more advanced students something to do if they didn't want to advance further in their own studies.

[1]https://en.wikipedia.org/wiki/Montessori_education

[jkhdigital]

Sudbury schools are even better. Unfortunately there are very few such schools in the world so you just have to get lucky and live near one, or start your own.