The most important factor isn't the schools, it is the kids themselves.

California used to have the best schools in the country, and roughly a third of our urban population is Silicon Valley. It's home to the largest economy in the US by a large margin, and is one of the richest states.

Yet, somehow, for math:

https://www.nationsreportcard.gov/profiles/stateprofile?sfj=...

the only states/territories doing worse at math are DC, Puerto Rico, New Mexico, and Alabama.

I'm not sure what Alabama's excuse is, but the other three entries on that list have obvious economic problems (only low income urban, failed power grid, literally blowing away due to climate change).