Given this information, I am inclined to agree with __samuelkim__'s prediction. I believe that your performance is consistent with an ATAR in the low to mid-80s range.
Your best-performing subjects appear to be English Standard, Mathematics Advanced and Legal Studies. You should therefore ensure that you prepare for these subjects' HSC exams to the best of your ability, which will hopefully allow you to maintain this standard and achieve favourable overall results, which will in turn maximise the contribution that they will make to your ATAR.
On the other hand, it seems that Physics and Engineering Studies are your lowest-performing subjects. This sets the focus and could indicate that you may need to allocate more time and put in more effort towards your preparations for the HSC exam of each subject, including addressing any areas of improvement accordingly. Consequently, you will be able to perform better in each subject, allowing you to achieve a favourable HSC mark in both subjects.
If your desired ATAR is within the range of our estimates, then performing at a similar level to your current performance in your HSC exams would increase your chances of achieving such an ATAR. However, if your ATAR goal exceeds this range, then it is likely that you will need to perform at a higher standard in your HSC exams to have the best chance of achieving your goal. The fact that your HSC exams contribute 50% of your overall HSC marks is reassuring since it means that your HSC exams constitute a great opportunity for you to considerably improve your overall performance.
I hope this helps!
