[Strom]

I don't think the 30-to-1 ratio is the problem. From my own experience the main problem is grouping by age. Children should be grouped by skill instead. [1] I was always top of the class in math and held back by the slow pace dictated by the national education plan for my age. At the same time there were other topics like Russian language where I didn't learn as fast as was expected of my age. This meant that as the years went by I understood less and less of the new material that was being taught because my Russian fundamentals were weak. I imagine other children experienced something similar in math. I think we could do much better if children advance in classes based on how much they've learned, not based on when they were born. Also advancement in different topics need to be decoupled from eachother as much as possible [2], because I think it's completely expected that everyone will have their own personal strong topics and weak topics.

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[1] I think schools teach much more than just what's on the national education plan. Making friends, making enemies, dealing with puberty etc are all valuable lessons that have less friction when the group of people you're around have similar amount of experience with those things. Thus being grouped with people with wildly different experience levels in these areas can be detrimental. While the primary grouping factor should be skill, there's probably a good case for secondary range limits by age, which is a decent estimative measurement of children's experience in these social areas.

[2] I understand that full isolation isn't possible, because physics requires math knowledge, which in turn requires writing & reading skills. Still, even with these dependencies we could do a lot more decoupling than what is being currently done.