Every international test the United States takes part in, from fourth grade to adulthood. Countries are colored by their rank on the selected test, from light green (1st) to dark brown (last). The U.S. is outlined in gold.
How it is run, in the words of the sources. Hover a number for the quote.
Each dot is a country, placed by its rank on that test. The gold bar is the U.S.; ringed dots are countries not measurably different from it. Click a row to map that test.