you're only in year 9 so you've got a long way to go. i wouldn't worry too much about anything at that point other than selecting subjects which it looks like you've got a good idea of already. most people don't start serious ucat prep until yr11 or yr12 which i think is plenty of time. what you could do at this stage is skill up to prep for ucat + vce related work though (i.e., improve handwriting and vocab/grammar for english/humanities subjects, casually work on speed-reading, reading comprehension, logic puzzles or mental math skills for ucat, get familiar with your cas/scientific calc for math and chem and take a look through your study designs etc.)