It’s great that you’re taking this seriously now, turning things around in Year 12 absolutely still gives you a strong shot.
A 33 in Biology isn’t a disaster. It’s slightly above the state average, and depending on how your Year 12 subjects perform, it may only contribute as a 10% increment to your aggregate. That means your main focus should be maximizing this year’s scores.
Your current averages are actually encouraging. Scoring 94% in General Maths and 95% in Health & Human Development suggests you’re tracking toward strong study scores if you perform well on exams. English at 78% is important because it must be in your primary four. Even lifting that into the mid-80s could significantly impact your final ATAR. Economics at 81% also puts you in a competitive range if you finish strongly.
While percentages don’t directly equal study scores, using a percentage calculator such as Prozentrechner(https://prozentrechner.site/) can help you see exactly how much you’d need to improve in a subject to hit specific targets. That makes planning much clearer.
An 85+ ATAR is definitely realistic from here. A 93 will require exceptional exam performance, but your current trajectory shows it’s not out of reach if you stay consistent and focused.