Diversity is potentially a source of program but also of factionalism. Children of immigrants would seem to be integrating into Australia given their excellent exam results.
When the government privileges some newly declared Australians over the rest of Australia, the government violates the implied authority given to it to treat all Australians equally.
The average collectivist greens person does not want to increase immigration either because of greed or prejudice. However, a larger population will preserve the environment if a system of private property rights is maintained.
The ultimate purpose of the immigration/refugee policy should be to permit as many people as possible to enjoy liberty and prosperity as Australian can offer them.
The selection criteria can be improved by making it as objective as possible.