I'm in the SF bay area w/ middle school and high school age kids. Between San Jose and San Francisco, 15%-30% of kids are in private school (it's 30% in SF where the public schools are extra dysfunctional). That's far above the California statewide average of 8% in private school. Among our peers, somewhere between 1/4 and 1/3 of kids are doing advanced math outside of school, typically either Russian School of Math…
Do you have more info on this? Where is it coming from and what does it look like?
Because this is actually crazy if true.
Like, just compare to a situation where they strongly discourage Reading outside of school.
Not to mention that math is just a basic life skill and it gets exercised just going through normal every day stuff (at least middle school level math)