School is where you kid spends the majority of the time. If they find it boring, and the school is unable/unwilling to provide enrichment, then it is an uphill battle to resist that. The ideal solution is to make the work they do at school engaging, then they'll seek out enrichment at home themselves.
There might be math-oriented stuff online (3Blue1Brown is one off the top of my head) that keeps them wanting to understand more. That might anchor their school work a bit, or give them something extra to try. Books can help too.
Being a product of the US school system, the most important lesson it taught me is that teachers as well as students are caught up in a system that's bigger than they are, so in order to educate oneself, one need merely (a) organise one's own time effectively, but (b) avoid doing so indiscreetly, such that it could force other pawns to call one's lack of genuine participation to the attention of the Man.
90% of success in primary and secondary schooling is just showing up; as long as you keep your grades up, they won't demand mental attendance, only the physical.
denn meine Gedanken zerreißen die Schranken
und Mauern entzwei: die Gedanken sind frei.
I agree, but would like to add that the US public school system also has a bad habit of teaching to the test, namely standardized testing like the ACT or SAT. As it turns out, my time would have been better spent learning how to budget long term or navigating the US healthcare system as opposed to learning maths rarely seen in the wild or that the mitochondria is the powerhouse of the cell. The information imparted to me during the entire four years of high school has largely been forgotten, "replaced" by more practical knowledge that I wish I'd had even a tiny bit of upon entering adulthood.
The ideal solution is to make the work they do at school engaging, then they'll seek out enrichment at home themselves.
One thing I haven’t seen brought up in this discussion yet: technology. Seriously, what hope does a teacher have for getting students to engage when they’re competing against all the might of Silicon Valley? The industry is spending billions every year to discover and implement the best techniques for stealing teenagers’ attention and focus away from everything else in their lives.
There’s a growing chorus of people who want to get phones out of classrooms. That’s a strong first step but students’ struggles don’t end when they go home for the night. I volunteer as a tutor with high school students at an after-school homework club. We aren’t allowed to take their phones away! You can imagine how much of a Herculean struggle it is for these kids to put away their phone and actually get some work done.
There might be math-oriented stuff online (3Blue1Brown is one off the top of my head) that keeps them wanting to understand more. That might anchor their school work a bit, or give them something extra to try. Books can help too.