Congratulations on your HSC marks in Engineering Studies and Mathematics Advanced!
From this information, your performance appears to be consistent with an ATAR of at least 98 and up to 99 (similar to trenboloneacetate's estimate). Your performance is evidently of a high standard across your subjects, meaning that all of your subjects are highly likely to make positive contributions to your ATAR. Based on this, your goal is to replicate this standard in your HSC exams, which you can definitely do by preparing for your HSC exams to the best of your ability. Your current performance indicates that your study strategy has been effective throughout year 12, and it would therefore be a good idea to continue to use this strategy as you prepare for your HSC exams.
While your performance is undoubtedly excellent, your position may be slightly better in some subjects than in others. For instance, Business Studies and Mathematics Extension 1 seem to be your best-performing subjects, which shows that you are comfortable and confident in your ability to perform well in your Business Studies and Mathematics Extension 1 HSC exams. This also means that you may be able to focus more on your preparations for your English Advanced and Mathematics Extension 2 HSC exams, which can assist you in addressing areas of improvement (if applicable), and ultimately further solidify your overall performance and achieve your ATAR goal.
I hope this helps!