My son will take Algebra in 7th grade through our gifted program. I wonder what that means for this study.
I would think nothing in that the study seems to be indicating that kids who are average - below average in terms of achievement in math don't do well long term with taking Algebra I in 8th grade. I can't imagine that your ds is average or below in terms of math achievement if he is taking Algebra I in 7th.
My dd12 is also taking Algebra I in 7th this year and I'd say that probably 1/5 of her grade is doing the same, but her school is one of the highest achieving middle schools in our state so there are probably a good chunk of high achieving math kids.
What I'd be curious about is whether average or high average
ability kids who are above average or well above average in math achievement do well long term with math acceleration along the lines of Algebra I in 7th or 8th. Where we're at, my guess would be that most kids who are average or above in math
achievement take Algebra I in 8th.