The US schools were among the best in the world. Since Bush, however, the US school system has slipped in the global rankings. I believe number 34 globally in math and around 20th in Science. Very low for a country of its magnitude.
My children study for their high school exams, US curriculum, and subjectsclike history, geography and social are 90% about US history and maximum 10% on world history.
Sorry to burst your bubble, but the US school system is not on par with most of Europe or Japan, China.