I think the reason education got so bad is we don’t have accurate signals. Most studies use the passing rate as their metric of “achievement”, and that can only see changes among the bottom quintile. Or, they use standardized assessments, which usually do not go higher than the 90th percentile. I wrote a longer post here: https://www.lesswrong.com/posts/LPyqPrgtyWwizJxKP/how-do-we-fix-the-education-crisis
I think the reason education got so bad is we don’t have accurate signals. Most studies use the passing rate as their metric of “achievement”, and that can only see changes among the bottom quintile. Or, they use standardized assessments, which usually do not go higher than the 90th percentile. I wrote a longer post here: https://www.lesswrong.com/posts/LPyqPrgtyWwizJxKP/how-do-we-fix-the-education-crisis