Places like China and Vietnam are the ones rocking the test scores. These places operate on a tiny fraction of the $ per student of most places in the world, even PPP adjusted. And I think China's increasingly absurd achievements [1] make it clear that this goes beyond the test.
I think the nurture argument can still apply there - Chinese parent is a meme all its own, and for a good reason. But this isn't something that can be achieved with money or digital tech. It's a combined mix of culture and parenting within that culture. Perhaps if the people so invested in trying to improve the education of children were, themselves, having more kids - we might not have such a problem.
> It's a combined mix of culture and parenting within that culture.
The problem is, that culture (and other more or less closely related Asian cultures) also produces an awful lot of psychologically awfully damaged adults - and many Asian countries are now facing the consequences of that, with hikikomori, women not finding suitable partners, rock bottom fertility rates and collapsing demographics.
And on top of that, you may get really obedient children, excelling at following what they know to do... but creativity? Thinking outside the box? Going against the script? Thrown into unfamiliar situations? Whoops.
It's getting better, slowly, no doubt, and we're seeing the results, but I'm not certain that progress comes fast enough to save some of the societies facing the demographic bomb the hardest (especially Japan, but China is also heading for serious issues). With China especially, it may also get interesting politically once a generation grows to adulthood that can see through the CCP propaganda.
> Perhaps if the people so invested in trying to improve the education of children were, themselves, having more kids - we might not have such a problem.
That assumes we have people actually interested in furthering the education of our children, and that is something I heavily doubt.
All we have here in the Western world is the contrary: we got austerity / trickle down finance ideologists that see education in general as a field ripe for savings on one side, then we got history revisionists actively trying to erase what children get taught about our past, and if all of that weren't bad enough we got the religious extremists trying to sell the gullible public that if you ban stuff like LGBT from even being mentioned in school books, children wouldn't turn out gay or trans - which is obviously bonkers.