You need to find a sort of motivation to study. This is because to study well and effectively, you need fuel and in most cases, the cheapest and most efficient fuel is motivation. Find motivation and you'll be 5x more effective and productive when you study. Personally, my motivation was the fact that I didn't have time to study that much and that was because it took me 40 mins to walk from my school to the local station where I had to take a bus and so it effectively took an hour and a half before I was ready to study. Some days I had to stay at school for another hour because of some extracurricular and this ate more of my time. This made me feel that whatever remaining time I had was precious and that's what motivated me to study. You can find motivation in anything really e.g. taking inspiration from successful people, older siblings, etc. Now as for study timings, study whenever you feel like it and whenever you can. Sometimes, setting a particular study time can be useful, but as you move to VCE, you may end up studying at the wrong time and this can result in burn-out. I recommend taking sufficient breaks so that you can stay alert and energised for each study session.
In the end, experiment with whatever works for you. If you like studying before school (which is absurd to me but maybe normal for you), then go ahead and if you prefer studying after school, study then. I hope this helps and I hope you make it into whichever school you're aiming for.