Given this information, your performance seems consistent with an ATAR in the high 90s range. More specifically, that would be an ATAR between 97 and 98. Your performance is of a high standard across your subjects, with some being better than others.
English Advanced and Korean Continuers are your best-performing subjects, meaning that they are likely to make a very good contribution to your ATAR. Being ranked first is an advantage, especially if you also manage to achieve the highest HSC exam mark in your cohort for these subjects. This is because in such a case, your overall HSC marks would be made equal to your own HSC exam marks, meaning that you would technically not be affected by the moderation process. This would, in turn, allow you to achieve a very high mark in both subjects. The same principle applies to Music 2 given your rank.
Your performance is also favourable in Chemistry, although perhaps to a slightly lower extent. This means that while this subject is likely to make a positive contribution to your ATAR, you may be able to enhance that contribution by performing better in your Chemistry HSC exam.
This leaves us with Mathematics Extension 1 and Mathematics Extension 2. While your performance is not unfavourable in either subject, they do appear to be your lowest-performing subjects compared to the rest of your subjects. This indicates that there may be more room for improvement here which, if addressed through your HSC exams, would allow you to achieve an ATAR that either matches or exceeds this estimate.
I hope this helps!