Hey Sunshine!
Welcome to the absolutely harrowing journey of Year 12. It might seem scary and daunting at times, but just keep your head up, and never stop trying. Becoming a doctor is no easy feat, I'm sure you know, but I bet you are determined enough to pursue your goals.
What subjects are you doing for VCE? Have you made any decisions for where to study at university? Anything you might be keen for, or doubt at all? A lot of us have gone through Year 12, and we all have different ways to help the current students out. My advice is; always try your hardest, one bad SAC score isn't the end of the world, and no matter the outcome, whatever the ATAR is, finish high school knowing that you did your best.
Best of luck for your VCE journey, let us know how you go too!