Even if you don't get in, there are still pathways to get in...
For instance, enroll into an Arts degree, average a distinction for the first semester, enroll for mid year intake, chances are, you will get in... ATAR doesn't mean anything...
Or, enroll into a business degree, finish it, apply for JD (a course tailored for those who have finished an undergraduate course... You still require half decent grades to get into this one), congratulations, you have a business and law degree (with only a year extra than what it would take you to do a double degree)... (JD's are phenomenally expensive for what you get though)... (This way will probably leave you penniless and ineligible for FEE-HELP funding to complete your PLT, also... which would mean that you will need to pay for your PLT out of your own pocket... FEE-HELP is capped and many of the JD courses are hefty in their fees and quite often pass the prescribed quota before the degree even finishes...)
You can also apply for a LLB degree after finishing a undergraduate degree... usually, they let you shave off a year, same drill as the JD (far cheaper though, and won't leave you penniless by the time PLT comes around... Much more competitive to get into though, and LLB degrees are a dying breed in universities, a law degree for a university is quite the money maker, JD's make universities big bucks and look more prestigious at face value, they are, however, the exact same degree as an LLB...)
(Saw the penniless chaps time and time again at Leo Cussen, can't believe the JD students actually thought they had one up on the LLB students as well... JD's are the biggest rort by universities)
Those two pathways are probably the more popular ways of getting into a law degree... (Outside of your conventional VCE/HSC enrollments... those who are completing year 12 these days are looked at far less favorably than the candidates that I mentioned... VCE/HSC students are also ineligible to do a JD unless they have completed an undergraduate degree)
I think the first question you should ask is whether you really, really want to do law... It's a forsaken path that is quite a money pit with, admittedly, limited prospects to be successful... For the money you are paying in HECS-HELP and/or FEE-HELP, there are a lot of degrees with far better career prospects than law... I'm not saying that you would be unemployed till eternity with a law degree, all I am saying is that you shouldn't expect to be a lawyer right away... Expect a hard slog, so to speak, while job hunting... The job you do eventually end up getting would probably be very mundane and menial... This does not say that you will not eventually be a lawyer, it is to instead say that it is something that is testing and requires an incredible amount of patience... (Of which, many law students don't have)