China cherry-picked higher performing, higher socioeconomic regions for their PISA testing, where poorer students don't have access to HS & tests. US PISA score

China cherry-picked higher performing, higher socioeconomic regions for their PISA testing, where poorer students don't have access to HS & tests. US PISA scores would be very different if Cambridge and Minnesota and a few other regions were tested. Worth considering before social factors come into play, as large countries have a lot of variance. Not saying motivation isn't also an issue, but there are lots of motivated kids and great schools in the US if you know where to look. https://www.the74million.org/article/schneider-the-strange-case-of-china-and-its-top-pisa-rankings-how-cherry-picking-regions-to-take-part-skews-its-high-scores/ https://www.the74million.org/article/schneider-the-strange-c...