Rofl?
1) I don't see how someone can actually enjoy maths to the extent that they will miss it. I find maths extremely annoying.
2) So what if I do ext2 and am aiming for 99+ ATAR? I just want to get into my desired course.
3) And "nerd"? Only nerds call others nerds.
Hmm, I assume you're accelerating. If so, then that is quite an achievement!
Regarding your question, I'm not too sure, but I believe it'll simply scale to ~99.8.