Hey Nirav, I completely understand how stressful the application process can be (having gone through it multiple times myself) but it looks like you may be overthinking some things a bit now.
This won’t do any good for your application (and more importantly, yourself) at this point - so my recommendation would definitely be to do anything you can to distract yourself and relax until the offers are released. Do whatever works for you - go for a run or to the gym, read a book, go for a hike, try some baking, treat yourself to a nice outing with friends or family.
It can turn into a really long ordeal if you begin to question every component of the admissions process, and if it’s keeping you up late every night then it’s something you should be trying your best to avoid. You’re welcome to PM me for a chat if you wish.
Regarding your questions:
A PhD and a completed masters by research that is non-graded are awarded a GPA of 7 automatically, so yes they’ll take precedence over other degrees. As for the others, it depends - if you have a higher GPA in your one year of a bachelor vs someone with two bachelor degrees, then you should receive the offer over them because GPA is their key selection criterion.
There are two quotas - international students (who go through a completely different admissions process) and domestic students (this includes all Australian and New Zealand school leavers as well as those with tertiary study). All domestic students are in the same pool and are therefore “competing” against each other for a place.
Preference order will play no role in the likelihood of you receiving an offer - you’ll receive an offer for the highest preference that you are eligible for. An applicant with Griffith as 6th preference but with a GPA of 6.9 outranks someone with Griffith as first preference but a GPA of 6.8, for example.