We've all been through this stage in our lives, the oh so dreadful HSC. I was exactly in your position last year, didn't find the motivation half way through the examination period, so I kinda slacked off somewhere in the middle but pulled through towards my final exam (physics). Let me tell you, for 1 month of pure dedication, you'll be so happy come ATAR release date. You'll know that you gave it to your best shot and that there's nothing else you COULD have done.
Just 2 weeks more and you have 5 months off until university, 5 whole months!
Keep going! You're nearly there.
Edit: Wait until you get to uni lol, not a single fuck will be given any day apart from your first few months at uni haha. It's like HSC crammed into each semester.