If you're ranked 1st, no, your cohort will have no effect on your final HSC mark. You can still get a great HSC mark if you're ranked 2nd or lower btw, you just have to gear heaps of energy towards the External exams (which you should already be doing for a 99 ATAR). If you rank first and get the highest Exam mark in your class cohort, then that Exam mark becomes your Assessment mark as well.
Honestly, you should probably be more worried about procrastination and burnout. Those things hit me like a truck by the time I only had External exams left.
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