American students generally outperform their racial group in other countries. White Americans have higher PISA scores than any European country except statistical outlier Finland. Asian Americans beat every Asian country, and are second only to the wealthy, elite Chinese city of Shanghai (another statistical outlier).

Given that there are racial gaps in the test scores, it's not fair to compare the average of white Americans against the nation-wide averages of European countries, since they also have significant non-white populations.