Ever considered there may also be cultural reasons for some of this? I don’t think Chinese is generally considered when “disadvantaged minorities” is discussed.
There is a problem in general for men in education. In ore recent years the push towards coursework and away from exams has helped create this shift. In general boys are better at exams, girls are better at coursework. In the past assessments used to be almost exclusively exam based, in more recent times that has changed to majority coursework based. Perhaps there needs to be a push back a more even footing so boys and girls can be tested on equal footings?
There’s also the question of whether girls are being preferentially picked over boys in for university places. I honestly don’t think that’s the case. Girls generally get better marks than boys at school (see abound about exam/coursework) and as such would appear better than the average Bou on paper.
As for the enthnicity side of things, there’s almost certainly a lot more than “positive” discrimination going on.