You'd need a very good interview to get a JCU offer, not just a mediocre one- especially if you are non-rural!
For OP1, you need a decent interview for non-rural. I am not sure how interviews are graded but I assume it can't be broken down in like A+A A- B+ B B-, especially undergraduate interviews when one is just 17/18 years old. I am guessing it will have 3 levels: Extreme/OK/Failure. If the stratification is indeed like this, an OK interview will suffice for OP1 (non-rural). Anything below OP1, you will need an extremely good performance at the interview for non-rural candidates!
I think you mean the GAMSAT

Also, the thing about Melbourne biomed is that not everyone (and, in fact, barely anyone!) can actually afford to pay the full fee price, which is over $300k- and this is without a guaranteed entry into medicine at the end. After maintaining a 75 WAM, you still have to pass an interview at the end of your degree, which is very very possible to fail!
Melbourne biomed is extremely fast paced and content heavy, as with all other biomed degrees, hence it's much harder to maintain a high GPA which will make it more difficult to get a CSP spot in grad entry med.
Don't do biomed just to get into med, no matter what "guarantees" are in place- just like the Pitfalls thread says.
1. Full fee place . You monetized it to 300K. Perhaps you may be able to get 100K from HECS or similar scheme. Still, it is 200K+
2. Mentioned GPA. You clarified WAM (75). It shouldn't be hard for an OP1 person to maintain this under normal circumstances but there are individual circumstances.
3. Interview brings uncertainty but if you have no other offers and you doubt your UMAT/UCAT/GAMSAT skills, it is better than others if Medicine is your aim. The multiple choice qs and other format found in these exams may not suit all and only you are able to make a call if this is a reasonable assumption. One may do poorly in UMAT (say under 60 percentile) but ace GAMSAT but I suspect it may not be common. Also a decision regarding taking a gap year needs to be taken considering this.
4. If unlucky at the interview or if one wishes to change direction and try other courses, shorter duration graduate entry professional courses are available at Melbourne e.g Law, Engineering, Optom etc.
5. BioMedicine may be fast paced but I believe you should strategize. For example, @Griffith, to enable them to end up with high GPA, some students enroll in B. Health Science as the 3rd year of this program is mostly electives and not content heavy. They strategize and use the light 3rd year to study for GAMSAT. (They shun BioMed at Griffith as it is content heavy). I know people who have succeeded in this strategy but I also know people who took the harder courses like Pharmacy, physio etc and have succeeded in getting into graduate medicine. Again this decision can only be made by the student. It is a matter of strategizing.
This type of advice "Don't do Melbourne biomedicine to get into medicine" may not be appropriate for all and I am surprised to see this type of advice being given frequently on this forum without a waiver. The trick is to strategize and do according to your own circumstances. I pity the students who blindly follow advice but I hope students do question every decision they make and "decide according to their personal circumstances and conditions". If they don't do that, they don't deserve to do medicine.
To the original poster:
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Some of courses are time sensitive (deadlines, current high school/gap year students only, ATAR, etc). Good luck with the research. I would only recommend Melbourne in some circumstances (in this case as a backup for a person with ATAR 99.05). You may do this: 1st round: La Trobe Dentistry (example only) 1st choice. You will get VTAC 1st round offer (if ATAR does not move much from last year - it was 98.95). (if you want you may accept and Defer but you don't have to do this). Next move Biomedicine to 1st choice in VTACand put yourself in contention for 2nd round . You will get the vtac offer in the second round. You will end up with more choices. But by then you would have heard from QTAC (JCU) or or UAC (JMP). You can leave yourself with a lot options for you to decide in February. Good Luck All.