Don't stress out about your SACs. It's extremely difficult to determine anything from them before statistical moderation.
Here's VCAA's explanation if you're interested:
http://www.vcaa.vic.edu.au/vce/exams/statisticalmoderation/statmod.htmlCalculation of the study score is a head case - your scores are first standardised.
Standardised GA = (Your score - State mean)/State standard deviation
After standardising, each GA is then weighted and added. For psych, eg:
(Standardised Exam 1 score x 0.33) +
(Standardised 3/4 Coursework score x 0.34) +
(Standardised Exam 2 Score x 0.33)
Following this, each student is ranked in descending order. (Eg 15,000, 14,999...) The ranks are then distributed normally on a bell curve. So:
The mean study score is set at 30. A score of between 23 and 37 shows that you are in the middle range of students; a score of more than 38 indicates that you are in the top 15%.
2% of students will get a score on or above 45
9% of students will get a score on or above 40
26% of students will get a score on or above 35
53% of students will get a score on or above 30
78% of students will get a score on or above 25
93% of students will get a score on or above 20.