I’m pretty sure you’ve already got guaranteed entry into that course... with that atar you’ll definitely get in. Plus you’ll get bonus points for your performance in ex1 and ext2 maths...
I’m afraid not much. It’s not the end of the world. Depending on what you want to do you may not even need an atar. Tafe is also an alternative pathway =)
Wrong place to ask but yes completely doable. You need to make sure you have a really good set of notes. Aside from that it's just the usual but having very well written notes either by yourself or someone else is essential.
I was kind of the 'normal' e4 student as such in that I didn't spend THAT many hours each week like the Math state ranks on BOS do. I think for 4u probably 2 hours a day? and for 3u it was really irregular because I found it became easy due to doing 4u.