Probably it's possible that the gene the increases mental capacity and learning is stronger or at least more common in Asians then it is with other races. But it also has to do with the effort they put into it or how hard their parents push them.
No, I'm correcting assignments and we have a lot of exchange students from china and they suck. They're terrible. They're usually from the wealthy crowd, so it seems they expect to pass just because they pay. It's all about hard work