I'm just afraid of the correlation between ATAR and GPA and that I won't be able to achieve the 75%+ average required to do pursue the Juris Doctor. I know it's selfish and stupid of me to say this; but I don't want to pursue any alternative law degrees because the reality is that alternatives can only get you so far.
Well, you are wrong on two counts. Firstly, you assume that there is this strict correlation between ATAR and GPA; this is somewhat true, but it reflects work ethic more than intelligence. As you worked poorly, you got a lower (but still an excellent) result than expected. If you realize ATAR and GPA correlate more to work ethic than intelligence, you will realize you can boost you results with just putting more effort in. Stop with this self-defeated attitude and just accept you can do it; put the effort in, and you will succeed. Life is about effort. Secondly,
you sound stupid because plenty of universities can offer you just as good a law degree (Monash's JD or even their LLB which has the same content, I believe) except it might not be a graduate level degree and therefore lack the luster in the international arena. If you think your university, your
alma mater, alone makes a barrister or solicitor, you have another thing coming. Prestige is somewhat important in law and so I would encourage you to aim high, but you can do equally as well at a lower-tier law school if you, once again, put in the effort and have a personality conducive to the career.
EDIT: Sorry I was harsh there. I just think it is a bit stubborn to say what you said. Forgive my abrasiveness; it does not excuse my manner.