Ah, a product of the Russian educational system - the article specifically mentioned 65 countries in the study. Not to mention you're making assumptions on how the math was scored that cannot be inferred from the article or data. Or bringing up the favorite boogeyman in Russian media - America - to deflect blame in Russia's shortcomings. Lets face it, in Soviet times, Russia was a powerhouse of scientific innovation and scientists were treated as national heroes. Now science has gone down the shitter, anti-science runs strong and is growing daily. The government's taking over the RAS bodes ill.
BTW students do learn calculus, physics, chemistry, etc. in US schools. And you can read some of the results of the UN study - in which 470,000 students took part in - and some of the reasoning why countries like Finland and South Korea are so much better than Russia. The superior educational systems teach how to apply knowledge while Russia teaches by rote and memorization. In fact I do know people currently enrolled in Russian schools, where they literally have to memorize hundreds of poems when they are 6 or 7 years old.
Sorry if I sound bitter. I really had hope that after the Soviet Union fell, Russia would become a free country with all the legacy of Russia's rich cultural history. I was proven wrong on both cases, and every day I get more evidence that the country is going down as a neanderthal fascist state.