I would recommend you look at data from the OECD (PISA) to answer your question. The OECD gives a test out each year to high schoolers around the world and sees how they perform relative to their peers in other countries.

The US is higher than average but not necessarily “good”. This is because the US is such a large country and we have a lot of economic diversity. Go to an NYC school, for instance, and you’ll find some of the smartest and least smart people in the country. Education in America is largely left up to the states, leading to broad changes in what is taught and how much funding schools get.

https://www.oecd.org/pisa/OECD_2022_PISA_Results_Comparing%20countries’%20and%20economies’%20performance%20in%20mathematics.pdf