Your topics are quite different to mine!! For Ext, i investigated the conflict between the political and cultural spheres of the early 2000's that influenced the construction of history by the National Museum of Australia. How did you go in your major work?? By the looks of it, i think you're more inclined to Ancient History am i right?? haha.
My Ancient cohort is a large 16 people lol, and my modern has 34. I go to Baulkham Hills High. I think im more inclined to Modern, not too sure, i enjoy both of them equally though (and sometimes not much at all) haha. How were your trials?? (bet you aced your histories...seemed soo prepared for them! lol) Do you want to extend your passion for history in university?
btw, im pretty sure you can get 90+ ATAR!! (just do what everyone else in my school seems to be doing now and ask people on this forum for an ATAR Estimate in the 'Guidance and Counsel' section haha, im sure it'll reaffirm your confidence in your ability to achieve your goal!!)