My friend went to James Ruse and I am sorry to say that nothing you said is fully true, I think you may have been misled because some of things you say are partially true. For example, there are asian students, but there are also indian, white, iranian ect.
I don't think they 'teach you to pass the test's but if they don't think you are going to get top grades the school will drop you, so there is a lot of pressure. Personally I wouldn't want my kids going to that school, I don't think the type of pressure is worth the mental health repercussions later on.