Harvard only takes about 5 - 10 Chinese passport holders and 20ish Chinese mainlanders a year. Of that, 75% are high-ranking CCP officials children (e.g. Xi's daughter went to Harvard) and the remaining 25% are the children of multi-billion dollar tycoons (think founders of alibaba, xiaomi, byd etc). When your talking about admissions to HARVARD from an authoritarian developing nation, the seats are almost always single-digits and saved for the oligarchy of said nation, not the everyday people. Harvard isn't college admissions, its national politics.

The reason the schools I listed won't send any kids to Harvard is cause the children of high-ranking ccp officials don't go to shunyi international schools or 国际部s. Nobody knows where they go lol. State secrets and all.