Here are PISA scores for 15-year-olds as typically presented by politicians. When you see these, it’s easier for Americans to be more alarmist (oh no, others are ahead of us!).
Percentage of high scorers
But we also should look at the data another way.
Number of high scorers
Our size benefits us, and we need to remember that too. [of course we have many more LOW scorers as well…]
More data at American Achievement in International Perspective.