From this information, you seem to be currently on track with an ATAR in the low 80s range. More specifically, that would be an ATAR between 81.5 and 83.
Geography is your best-performing subject. This is especially true given your optimal rank, which will allow you to maximise your Assessment Mark. If you also achieve the highest HSC exam mark in this subject within your cohort, the moderation process will work in your favour, as your overall HSC mark would essentially be made equal to your HSC exam mark. This therefore gives you a great opportunity to maximise your overall result in this subject, resulting in a positive contribution to your ATAR.
The same can be suggested regarding your position in English Advanced and Biology, although to a slightly lower extent. This means that while both subjects can potentially make a positive contribution to your ATAR, there is potential for improvement to your overall performance (and by extension, the contribution of each subject to your ATAR) through favourable HSC exam performance. Hopefully you did well in your English Advanced HSC exam and best of luck with your Biology HSC exam.
On the other hand, Mathematics Advanced and Economics appear to be your lowest-performing subjects, indicating greater room for improvement compared to your other subjects. This warrants additional focus on your preparations for their HSC exam, allowing you to improve your overall performance and increase your chances of a higher ATAR. Hopefully you did better than expected in your Mathematics Advanced HSC exam and best of luck with your Economics HSC exam.
I hope this helps!