I think there should be four years of math, but I think there should be a much slower option for kids that need it: spend two full years on what we now call Algebra one, then geometry and Alg 2.
I've been watching high school kids learn math for nearly 20 years. Math, more than anything, is something almost anyone can learn given adequate time. I also have seen that the problem, more than anything, is a wobbly understanding of the fundamentals of Algebra. So do Algebra 1 SLOW. Work in lots of repetition and application. Then build on that. But don't rush them through Alg 1 when they aren't ready to go that fast, then make them do it again when they fail. Do it slow, do it right, make sure they get it.
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