poorer education could mean the lack of resources, correct guidance, or the recognition of the importance of education. Especially for maths subjects, it is important to explore students' interests otherwise it would be merely "rot learning". As the thread starter has mentioned, this may be a cause of people being bad at maths, which may eventually lead to undesirable study scores. as a result, future maths academical related career opportunies may be restrained.
it is certainly true that a large proportion of Asian parents pay much attention on their children's education, and some parents' high educational background may even further benefit their children's academic success. However, that doesn't mean the top mathematicians in Australia are only limited to asians, there are heaps more other than terrence tao. there are many non-asian family who emphasise education and care about their children's study just as much as asian parents do. My point being that a person's family background, environment, which are irrelevant to their race, can affect his academic status.