I've enjoyed GT7 (good online mode) and Assetto Corsa (great realism and sound design). If you want something less realistic and more of an 'arcade' racer, need for speed is basically the gold standard for playstation.
Remember, UNSW uses UCAT+ATAR+Interview to make their offers for med. Even though your UCAT might make you less competitive, your ATAR and/or interview can greatly increase your chances of getting an offer.
It's just your internal ranks for your subjects, no marks or anything pertaining to the HSC exams (iirc from last year). I think the purpose of it is to check them against your report to make sure they're correct.
Based on the samples provided from the 2019 HSC, it looks like the scanners pick up writing that is well past the end of the lines. I'm quite sure only the grey part near the spine of the booklet gets removed.