Just wanted to update this with my final ranks and marks for a better estimate.
School rank: ~130
Eng. Adv: 7/63 (87%)
Legal: 7/32 (90%)
Economics: 8/22 (82%)
Modern: 6/31 (75%)
SOR 1: 5/70 (84%)
Italian Extension: 2/3 (94%)
+
Accelerated Italian Continuers, HSC mark: 96
Is an ATAR of above 94 achievable if I do well externally?