I really only skimmed the article, but I still think life is what you make of it. You are your own person.
With all due respect and kindness, i don't think this is the right way to go about it. This is almost a mythical legend.
No one exists in a vacuum, everyone is the product of their environment. Life is what you make of it but only if you have the opportunities to make use of. Tell a poor kid in India, "life is what you make of it, you can succeed if you try!", a slave in the old south, a political dissident in one of the many countries around the world.
The idea of the totally self-made man is a myth, especially prevalent in the USA and other capitalist nations. As John Steinbeck (allegedly) said: "Socialism never took root in America because the poor see themselves not as an exploited proletariat, but as temporarily embarrassed millionaire". Before you are even born, before you summon up the will in your mind to try in VCE, before you pick up a pen, your future success is already partially determined for you, for the average kid. This is by environmental factors you cant remove with sheer will.
I still feel that if you want something badly enough, you will get it.
Kids in public schools don't want to succeed as badly? Poorer kids simply don't want to succeed as badly as rich kids? This explains the statistics and the graphs? I doubt it. There are many people who have wanted something so badly and never got it. Look at all the small businesses that fail, all the people prevented from getting where they want to be due to other factors in their life. Wanting it badly helps but it is by no means a guarantee.
Conditions such as disability, lack of resources, etc. etc are barriers that can be overcome if the individual is determined enough, or has a strong support network.
Again, poor kids aren't simply trying hard enough or something akin to that? I reject this notion. A disability is called a disability for a reason, you are less able to do something, that should be acknowledged, not ignored. You can do wonderful things despite that of course but it cannot be denied that a disability, lack of resources, poverty, etc put you at a distinct disadvantage.
A more broader example would be to do with top-class American neurosurgeon Ben Carson who was raised by an illiterate single mum in poor conditions. These are just a couple of examples where people can outshine the competition no matter how they were raised.
How many poor kids who wanted to be neurosurgeons but never made it? Probably more than who did make it. Just because one escaped, it doesn't make it ok that people are living in conditions like this, it doesn't make them any less disadvantaged or oppressed.
It then follows that a public or private school education would create a marginal difference in Uni performance. Instead, it has got to do with the traits of the person.
Traits are important but to deny environmental factors play a key role would be silly.
Again, i am not going after you personally, i do not want to act you or upset you but we can't let these ideas like this go on, it provides an excuse for people to not fix the real issues like poverty and inequality.