A1 is probably the only one that will give you an exact figure, but to be honest I don’t think it’s particularly helpful to worry about the nitty gritty details in your situation (as you’re going to attend the interview regardless, so the figure won’t be affecting financial decisions etc). You really just need to give the interview your best shot, and as a past interviewee at UNSW who was told you did well (IIRC?) you’re in a very good position with your score combination.
It’s impossible to say how much you could “screw up” your interview by, as this is entirely dependent on the cohort of interviewees for that year - the average interviewee score is probably going to fluctuate each year.
To receive a CSP, you’ll need to be roughly in the top ~24% of applicants post-interview, if my calculations serve me correctly. Obviously this value isn’t exactly spot on as some people that get offered a UNSW place will end up declining and going to other universities.
Anyone, rest assured that you’ve done an incredible job with your academics and UCAT and that you’re in a very good position thus far!
Best of luck