> Gaokao et. al. are held once a year, if you want to retry you need to wait a full calendar year, and the single-time test covers all subjects simultaneously. To compare to SATs, those can be retaken multiple times a year, and the non-core subjects are separate, so any individual sitting is much lower stakes.

You don't get to know your gaokao score when you apply to schools.

But you do know what your score is likely to be; that's how people choose what school to apply to. It's not very difficult to predict your score in advance of taking the test.

Given that, why do we think the annual frequency makes the test "high-stakes"? The normal case is that you go in expecting a certain score and get something close to it. If you wanted to take it again the same year, you'd expect a similar score. If you wanted to spread it out over several days... you'd expect a similar score. There just isn't a large population of people who perform one way on practice gaokaos that are very similar to the real gaokao, and markedly differently on real gaokaos that are very similar to practice ones.