Replying here to leave the trolls’r’us to their kvetching.
It’s not a number at all AFAIK. They just let in the kids who do best on the test. And one of the proposals was a lottery, which will obviously do a worse job at finding the best students than almost any kind of assessment.
Besides, this is irrelevant to my point, which is that if you want to claim Asians are over-represented then you need to show that they have some kind of unfair advantage.