American parents are sending their kids to 'Russian math' (2017)
My college had a decent-sized contingent of Bulgarian &amp; Romanian international students.  The difference in their math abilities upon entry was striking.  While most of my American-born classmates struggled in discrete math, linear algebra, and vector calc, my Bulgarian friend was like &quot;I learned this when I was 9.&quot;  They were frequently tapped as TAs by the professors, because they <i>understood</i> the material on a level that Americans didn&#x27;t.