>I think on average the difference between a high school student from Russia and US is negligible
I don't think so, compared to the difference between the US and my country (which is western but closer to USSR/Russia regarding math curriculum). I think you overestimate what the average US high school student learns...
I don't think so, compared to the difference between the US and my country (which is western but closer to USSR/Russia regarding math curriculum). I think you overestimate what the average US high school student learns...