Hi!
I get taught at a private school, and I have to say we are very prepared for this. Our school is global and has locations all around the world, and each campus has been doing online learning for ages already. Even when we are at school, we learn via Zoom with other students from all around Victoria. Therefore, we are very prepared, our term is still running as normal, as we are just joining our usual Zoom classes, but this time, from home. So our learning really doesn't change during this time. While exams have been pushed back and the term extended, we have already been doing the term as normal, so we will just have extra time to study for them. Remember this is not always an advantage as drawing out the exams too much is not good.
But you do not need to worry at all. I think focusing on your own learning will get you through because the term will be extended and VCAA is doing everything they can to ensure fairness among the students this year.
Hope this helps!