I know this a largely subjective question but just wanted to gather an idea of what others are doing. I'm not looking for a crazy ATAR but just enough to get into the top 5 at my school for a scholarship, 85 would probably get me pretty high up there and also get me into my course of choice. Currently I'm doing around 15 hours a week, is this too minimal or am I doing ok ? I feel on top of the content and my rankings are quite high but would increasing the hours make a substantial difference ? I also have multiple commitments outside of school like going to the gym for 2 hours 6x a week and working so I'd rather not lock myself up and study excessively for no reason.