Head up. You still got this. You can still sweat the HSC. Even if you don't do well, there are so many alternate pathways to get into the course you want nowadays.
This may seem obvious but with internals done, it's time to look ahead and focus on externals. Remember, you still have 50% of your HSC to go, so nailing your externals can make a big difference in your final ATAR, and ultimately, where you want to go in university. Don't give up just yet, there's only a few months left
Keep going, never stop, never give up. As everyone above mentioned, the HSC exam is yet to be completed, and is a great opportunity for you to make a difference. You have to believe in yourself and keep your head up. Don't settle! Remember: