Reviewed by Educatta's 97+ ATAR tutoring team. Checked against the latest TISC, UAC, VTAC, QTAC and SATAC information.
ATAR is a rank, not a score. It's a number between 0.00 and 99.95 that shows how you performed compared to everyone else in your age group. An ATAR of 85.00 means you beat roughly 85% of your cohort, not that you scored 85% in your exams. In WA, TISC calculates it from your best four scaled WACE course scores.
That one distinction clears up the biggest misunderstanding we hear from parents at Educatta every year. The detail underneath it is what most schools never properly explain: how the calculation actually works, what scaling does to your marks, and why the bell curve matters. This guide covers all of it, step by step.
What Is ATAR, Exactly?
ATAR stands for Australian Tertiary Admission Rank. It's the main number universities use to decide who gets offered a place in a course. In WA, that means UWA, Curtin, Murdoch, ECU and Notre Dame.
Three things to lock in before anything else:
- It's a rank. ATAR compares you against your entire age group, including students who didn't sit ATAR courses at all.
- It runs from 0.00 to 99.95, in steps of 0.05. There's no 100 (more on that below).
- In WA, TISC calculates it (the Tertiary Institutions Service Centre), using your results in WACE courses examined by SCSA.
Because it's a rank, ATAR isn't about hitting a fixed standard. It's about where you sit relative to everyone else, which is exactly why scaling and the bell curve matter so much.
How Is ATAR Calculated?
In WA, ATAR is calculated in four steps. Your school marks and WACE exam marks are combined 50/50 for each course. Those marks are scaled to make courses comparable. Your best four scaled scores are added together to form your TEA (Tertiary Entrance Aggregate). Finally, TISC converts your TEA into a rank: your ATAR.
Let's walk through each step.
Step 1: School mark + exam mark (50/50)
For each ATAR course, your final combined mark is half:
- Your school-based assessment across Year 12 (tests, assignments and in-class assessments, standardised against your school's exam performance), and half
- Your WACE exam mark from the external exams run by SCSA in November.
This is why coasting through the year and planning to "cram for the exam" backfires. Half the mark is locked in before you sit the paper.
Step 2: Scaling
Each combined mark is then scaled through TISC's marks adjustment process. Scaling adjusts for the fact that some courses attract stronger cohorts than others. A raw 70 in one course isn't worth the same as a raw 70 in another, so scaling levels the playing field. Students aren't punished (or rewarded) simply for their subject choices.
This is the part of the system that generates the most myths, and the numbers shift every year. Always check the latest TISC scaling report rather than last year's gossip. For the full breakdown, read our guide to how WACE scaling works.
Step 3: Your best four = your TEA
TISC takes your best four scaled scores and adds them together. That total is your Tertiary Entrance Aggregate (TEA). Eligible language students also receive a LOTE bonus on top.
Two practical consequences our tutors drill into students:
- You can sit five or six ATAR courses, but only your best four scaled scores count. A weak fifth subject can't drag your TEA down, but it does eat study time.
- Because scaled (not raw) scores are summed, a slightly lower raw mark in a heavily scaled course can beat a higher raw mark in a lightly scaled one.
Step 4: From TEA to ATAR
Finally, TISC converts your TEA into a rank against your whole WA age cohort. That rank is your ATAR.
Across the 1,525+ students we've taught at Educatta, the most common mistake families make is reading a school report average as a predicted ATAR. A 75% average does not mean an ATAR of 75. Once standardisation and scaling are applied, it can land meaningfully higher or lower depending on the subjects and the school.
ATAR works the same way across Australia in principle (combine, scale, aggregate, rank), but each state has its own admissions centre and its own rules for what counts. WA students applying interstate, or families who've recently moved, mostly need to know that the rank itself is recognised nationally.
| State | Who calculates it | What counts towards your ATAR |
|---|---|---|
| WA | TISC | Best 4 scaled scores (TEA), plus any LOTE bonus |
| NSW / ACT | UAC | Best 10 units, including at least 2 units of English |
| VIC | VTAC | English + best 3 scaled studies, plus 10% of a 5th and 6th |
| QLD | QTAC | Best 5 subjects (an English subject required for eligibility) |
| SA / NT | SATAC | Best 90 credits of scaled scores |
An ATAR of 90.00 earned through WACE means the same thing to an east coast university as one earned through the HSC or VCE: top 10% of the cohort.
What Is the Highest ATAR You Can Get?
The highest ATAR is 99.95, not 100. Because ATAR is a rank, a perfect 100 would mean beating 100% of your cohort, which is impossible. You can't outperform yourself. 99.95 puts you in roughly the top 0.05% of your age group.
A few reference points:
| ATAR | What it means |
|---|---|
| 99.95 | The maximum possible. Top ~0.05% of the cohort |
| 99.00+ | Top 1%. Competitive for Medicine and other high-demand pathways |
| 90.00+ | Top 10%. Comfortably clears most university requirements |
| 80.00+ | Top 20%. Meets entry for the majority of WA uni courses |
| 70.00 | Around the typical minimum for direct entry at several WA unis |
So what counts as a "good" ATAR?
A good ATAR is simply one that gets you into the course you want. For most WA university courses, 70–80 clears direct entry. Competitive courses like Law sit around 90+, and Medicine pathways typically demand 99+. Chasing 99.95 for its own sake is a trap; work backwards from your target course instead.
Only a small group of WA students hit 99.95 each year, and in our experience tutoring high achievers, they're rarely the "naturally gifted" stereotype. They're the students with the most disciplined exam technique and the most ruthless use of past WACE papers.
How Does the ATAR Bell Curve Work?
The ATAR bell curve describes how marks in each course are distributed: most students cluster around the middle, with fewer at the very top and bottom. Because ATAR is a rank, your result depends on where you sit on that curve relative to everyone else, not just on your raw marks.
Why this matters practically:
- The middle of the curve is crowded. Around the median, huge numbers of students are separated by tiny mark differences. A handful of extra marks in the WACE exam can jump you past hundreds of students and several ATAR points.
- The tails are sparse. At the very top, each extra mark moves your rank less, but it's far harder to earn.
- You're ranked against the real cohort, not a quota. There's no fixed number of 90+ ATARs handed out each year. The distribution simply reflects how the cohort performed after scaling.
This is the most useful insight in the whole system: if you're a middle-of-the-pack student, you're sitting exactly where improvement pays off most. When our tutors mark practice papers, the gap between a mid-band and an upper-band response usually comes down to a small set of fixable habits (misread command words, skipped working, no time strategy) rather than raw ability.
Common ATAR Myths We Hear Every Year
- "Hard subjects guarantee a better ATAR." No. Scaling rewards strong performance, not difficulty. A high mark in a moderately scaled course beats a poor mark in a heavily scaled one.
- "Your school determines your ATAR." School marks are standardised against your school's WACE exam performance, so a strong student at any school can reach a top ATAR.
- "ATAR measures intelligence." It measures performance in a specific system over a specific period. Exam technique, consistency and preparation are heavily rewarded, and all of them can be learned.
- "If you miss your ATAR, that's it." WA unis offer portfolio entry, bridging courses and pathway programs. ATAR is the main road, not the only one.