Throughout VCE I often tried to predict my own study scores by looking up what marks people got and what study scores they ended up with. I never really found anything, so this was a futile process. I did, however, save every score, exam mark, and study score I got in order to help future students who wanted to find out the same thing. I know this website is mostly full of people who got 95+ so pls don't be too harsh about my scores (which, for the record, I was extremely proud of):
English - Unit 3: 60% (18/30), 80% (16/20), 75% (15/20), 73% (22/30) - Average 72% B
English - Unit 4: 74% (37/50), 70% (35/50) - Average 72% B
English - Practice Exam: 60% (18/30) B
English - Exam: B+
STUDY SCORE: 34
Further Maths - Unit 3: 79% (64/81), 70% (28/40) - Average 74.5% B
Further Maths - Unit 4: 78% (39/50), 77.5% (31/40) - Average - 77.8% B+
Further Maths - Practice Exam: 70% (70/100) B+
Further Maths - Exam 1: B+ Exam 2: A
STUDY SCORE: 36
Biology - Unit 3: 80% (20/25), 68% (17/25) (AOS 1 Average = 76%), 68% (17/25), 76% (19/25) (AOS 2 Average = 72%), 81% (40.5/50) - Average 75.6% B+
Biology - Unit 4: 80% (16/20), 82.5% (16.5/20), 84% (21/25), 70% (14/20), 84% (21/25) - Average - 80% A
Biology - Practice Exam: 65% (72/110) B
Biology - Exam: C+
STUDY SCORE: 30
IT Apps - Unit 3: 68% (34/50), 93% (46.5/50) - Average - 80.5% A
IT Apps - Unit 4: 88% (53/60), 96.3% (38.5/40) - Average - 91.5% A+
IT Apps - Practice Exam: 82% (74/90) A+
IT Apps - Exam: A+
STUDY SCORE: 41
History Revolutions - Unit 3: 72% (36/50), 80% (48/60) - Average - 76% B+
History Revolutions - Unit 4: 85% (34/40), 80% (16/20) - Average - 83% A
History Revolutions - Practice Exam: 59% (47/80) B
History Revolutions - Exam: A
STUDY SCORE: 36
OVERALL ATAR: 80.15
If I had to make any comment (and if anyone actually cares), I'd say the biggest surprise was getting a 36 in Further despite some very mediocre SAC results. Keep in mind, however, that we were given very difficult SACs; about 3 kids averaged around 90% in their SACs but got 100% in the exam and ended up with scores around 47-49, so the SACs probably scaled up a lot. For the record, I corrected my exam afterwards and got 31/40 in the first exam and 56/60 in the second exam.
English was pretty much as expected.
Biology was the subject I put the most work into throughout the year, but the exam was like "holy shit what the fuck is this" kind of stuff, so I was probably lucky to even get a 30 study score.
History was a run-of-the-mill subject where my results were very consistent. An overall result of (A, A, A) was what I expected but was still a relief because history exams are fucking dreadful.
IT Apps is a little complicated; basically, our first teacher was complete horse shit and barely showed up and even if he did, he wouldn't teach (as reflected by the 34/50 in the first SAC). He left to take another job at Diamond Valley after 7 weeks, another interim teacher basically babysat our class for the sake of checking attendance and didn't teach anything, and the software development teacher wrote and marked all our SACs. My 68% was the 3rd highest score in the class, and technically it was 2nd because the person who got a higher score than me cheated. Then we got a new teacher who was an absolute gun coming straight from uni (I think he was about 22 years old) and he is, to date, the best teacher I've ever had. The rest speaks for itself and he basically saved my ATAR and helped me get a 41, despite the fuckery that happened at the start of the year. One dude who was a complete IT Wizard (and managed 88% without cheating on the first SAC despite the fuckery) ended up with a 46 and he also helped me a lot.
If I had to give any advice, I'd say never give yourself a distinct bottom 10%, because I did exactly that and the original bottom 10 I thought I'd have was 6 study score points higher than my actual 10%. Same story with a lot of my friends as well; e.g. my friend who gave up on music and got a 22, but ended up doing WAY worse than he thought in drama and got a 28. Regrets basically everything.
Good luck, current year 12s. Try your best and you'll have no regrets.