Demystifying SAC Scaling – The VCE Theory of Relativity

⏱ 3-5 min

Despite countless explanatory videos and posts being pumped out each year, the mechanics behind SAC moderation remain – for many students – seemingly irrational and shrouded in mystery. Our tutors are used to questions of ‘Why does VCAA get to swoop in and mess with my school marks?’, VCAA being the Victorian Curriculum Assessment Authority in charge of VCE exams and final study scores.

So if you’ve ever wondered why ‘average’ SAC marks can still translate to a strong study score – or why students from top-performing schools seem to get an extra ‘bump’ – you’re not alone. We’re here to answer these questions with a 5-minute rundown of SAC scaling and SAC rankings, made simple.

What’s the deal with SAC moderation? Our founder explains

 

Let’s get this straight – what is a SAC?

School‑Assessed Coursework (SACs) are self-explanatory by name. Like any tests or assignments you had in younger years, SACs measure your achievement of learning outcomes. The difference? This is VCE now, meaning SAC performance can make up anywhere from 40-60% of your study score, based on the subject.

• School-Assessed: you’ll have SACs peppered throughout your VCE years, all designed and marked by your teachers. Consequently, the format and timing of each SAC can vary between schools, differentiating them from the final VCE exams which are the same for everyone – ie. ‘standardised.’

• Coursework: Each SAC covers a certain ‘Area of Study’ (AOS) in the study design once you’re done learning it in class. This way, you and your teacher can monitor your understanding of the topic. A SAC could be anything, really – a flute recital for Music Performance, a traditional multiple-choice test for Further Maths or a Literature essay. Hence the umbrella term, ‘coursework.’

SAC scaling doesn’t create unfairness – it eliminates it

If VCE exams are a ‘standardised’ assessment, conversely this makes SACs ‘non-standardised’ from school to school. Imagine two students:

• Student A attends School A, where SACs are notoriously easy and teachers are lenient markers. Their average SAC score from Unit 3 is 90%.
  
• Student B attends School B, where challenging SACs and rigorous marking makes their 70% SAC average a significant accomplishment.
  

At first glance, Student A seems to have the clear advantage as SAC scores will contribute part of the final study score – but is that fair? Without a way of leveling the playing field, variability in task difficulty and marking standards would skew study scores, punishing diligent students simply because of what school they attend.

Enter statistical moderation – VCAA’s method of aligning everyone’s SAC percentages to a common scale, ensuring that your rank order – not raw grades – determines your contribution to the study score.

Your rank in the pack matters more than your scores

It’s natural to focus on the percentage you receive for a SAC, and fret over how it will correlate to achieving your dream study score. 

I only got X% on my last SAC, can I still hit a raw 45?!

Honestly? We can’t even begin to answer such questions without key info such as: What was the average mark for this SAC? and How many placed above you?

The reason is that VCAA couldn’t care less about your raw scores. Instead, it looks at how you ranked against all other students at your school in the same subject, also known as your ‘cohort.’ Let’s take another look at our example:

• Student A got 90%, but due to relatively easier SACs, a majority of their peers actually scored even higher (95%, 100%) – meaning they rank quite low.
  
• Student B’s score of 70% turns out to be significantly higher than their classmates, who were averaging 50% – meaning they rank near the top.

The takeaway: While you should keep aiming for good marks, understanding where you place in the cohort will give you a much clearer picture of the study score you’re tracking towards. Remember, it’s all relative!

VCAA uses your rank and exam score to scale SACs

So, you understand that your school-wide ranking is what matters most for SACs. But come the end of year 12, that flips – now, it’s you and your peers versus the state as you tackle the VCE final exam A.K.A the big equaliser. 

The same exam is sat by everyone, allowing VCAA to use it as a ‘yardstick’ to compare cohorts. VCAA will use your school’s performance on the final exam to understand your overall academic strength and scale SACs accordingly. Let’s unpack the logic behind this:

• Scaling Up: If a school’s cohort performs exceptionally well on the final exam, it suggests SACs were relatively challenging. 

Say Student B gets 90% on the exam, far above their 70% SACs. If they had a top rank in both SACs and exams, this proves B is a consistently good student, it’s just that their school had harder SACs. VCAA then scales up School B’s SAC marks to better reflect their demonstrated capabilities.

• Scaling Down: Conversely, if a school’s cohort performs poorly on the final exam, it could suggest their SACs were less rigorous. 

Even if Student A achieved 90% on their SACs, a weaker performance on the standardised external exam indicates their ability may have been overestimated. VCAA then adjusts SAC marks down so it aligns with exam performance.

Think of it as VCAA calibrating internal assessments based on an external benchmark; accounting for differences in SAC difficulty between schools.

Ranking high across SACs and exams is the best strat

Throughout the year, you want to be looking at your SAC performance relative to your school peers. Whatever ‘above average’ or ‘top marks’ looks like at your school, that’s what you’ll aim for if you want to maximise your SAC rank.

When exams roll around, it’s important to flip that mindset. It’s no longer ‘you vs. the school’, but ‘your school vs. the state.’ If you’ve been working diligently to maintain a strong SAC average, you want you and your peers to perform similarly in exams to prove to VCAA you deserve to keep your SAC scores, or even get scaled up. 

And if you’re not thrilled with your SAC scores, the exam is your chance to demonstrate a greater level of performance, that will in turn push SACs upwards.

We hope this guide has helped shed a little more light on the what and why of SAC moderation, and how you can leverage it to your advantage. Best of luck!

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