0/4, none of these are really under the aegis of the Beijing regime - and while it is flattering of you to compare the entirety of the population of four countries with 40 million people to the single most selective school in the US, it is rather inaccurate to do so.
If you look closer, PISA 2015 also had China in there, where the four provinces Jiangsu, Guangdong, Beijing, and Shanghai participated. Now poor illiterate migrants' kids might not get hukous to Beijing schools, so you might be right that this might be slightly biased - but even these four richer provinces have nearly the population of the US, so even if only 200 million Chinese are "outmathing us", it still makes a massive difference.
See: http://ncee.org/2016/12/pisa-2015-results/
The range of schools in PISA is much broader than the top sliver of students in Phillips Exeter etc you mentioned.
Anyway, don't mean to argue - it does appear on the news a lot "the chinese are out mathing us! America sucks!" with some political finger pointing, and my reaction is usually a facepalm coupled with wondering how controlled the comparison is.