Hey!
Great job on the biology exam. and congratulations for finishing VCE Bio. Whether you receive a 90+ atar is dependent on your other subjects (alongside with bio). Assuming that bio ends up in your top 4, to obtain a 90 atar this year, you needed an aggregate of 155. This means that you roughly need to score 40 across your other top 3 subjects next year. However, this is assuming you only do 4 subjects. You are likely doing 6 and assuming you get 25 on both of your bottom subjects, you end up needing 39 to obtain a 90 ATAR.
This is all based on bio being in your top 4, if it isn't it will only contribute 10% towards your aggregate.
Congratulations and hope this helps!