Yikes, considering that people in HK seem obsessed with their kids being in the "best" school, this study will just encourage the craziness further.
I'm a little skeptical. The whole thing seems predicated on test scores. So then they ask: "Do policies and practices
that improve early childhood test scores also lead to better outcomes in adulthood?" My problem is when they come to the part about 'kg classroom quality'. How do they define 'classroom quality'? While they admit that many factors can influence classroom quality - better teachers, better peers, better classroom chemistry - these are not quantifiable and so they go back to test scores: "f your classmates are doing well on tests, then it must mean that you’re in an effective classroom environment." So, you have better test scores because you are in an effective classroom and you are in an effective classroom because you have better test scores... seems weird to me. There could be better test scores because the teachers prime the students for tests. We would then be saying that focussing students on test scores is what matters to adult earnings rather than 'classroom quality', which even at the end of the article, they seem unable to define.