<p>Look, I don’t doubt that the US could do a lot better with its high schools, especially for top students in public school systems (with a few very notable exceptions). But I bristle a little when people keep talking about how much more successful other countries are, when we know perfectly well those other countries are so successful in their testing because they only bother to test 10-20% of any cohort, while the US is testing close to 100% on its basic tests, and about 50% on SATs or ACTs.</p>