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.
Only if there is a higher priority group in the molecule.
Edit: This would be an exceedingly rare case I imagine, so for all practical purposes, no you don't need to denote the position of an amide.
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.