Hi there Anna,
I have explained it better on this thread (https://discussion.atarnotes.com/d/9605-sac-score-study-score), however, I can try and give a summary to you.
Don't listen to the Deakin Study Score Calculator. All ATAR calculators are trustworthy, however inputting a few grades into a machine will not give you an accurate study score.
What matters is your SAC ranking. There is no difference between being ranked first with a 100% average, and a 65% average. While there are some other factors which may inhibit your study score, as long as you do well on the exam, anything is possible.
If I had to guess (sourced from the 2023 grade distribution https://www.vcaa.vic.edu.au/Documents/statistics/2022/section3/vce_health_and_human_development_ga22.pdf), given that a 47 is top 1%, and you can get a 41 with 67.5% on the exam, therefore you would probably need a 90 to get 46.
This is purely speculation, and please don't get too disappointed if you get below a 46. I see many kids who just pull out some random number out of thin air, without realizing how stiff the competition is, at the top.
