ACT senior secondary
ACT BSSS tutoring:
unit scores and the AST.
How an ACT ATAR is really built — and why Year 11 is where it is won.
Year 11 and 12 in the ACT is not the HSC.
The ACT awards its own Senior Secondary Certificate through the ACT Board of Senior Secondary Studies. An ACT ATAR is built from unit scores, cross-college moderation and the ACT Scaling Test — not from end-of-year external exams.
There are no external subject exams
The ACT runs no external subject-based examinations. Assessment is continuous and school-based, unit by unit, from the first weeks of Year 11. Nothing at the end of Year 12 can rescue a weak semester, because there is no single paper to rescue it with.
Most tutoring advice a Canberra family finds online is written for the NSW HSC, where one exam period carries enormous weight. That advice tells an ACT student to coast through Year 11 and work hard at the end. In this territory the opposite is true.
Marks accumulate from the first unit
A student’s course score is assembled from work already banked. By Term 3 of Year 12 most of the unit scores that decide an ATAR have been recorded and cannot be changed. That single fact is why intervening early in Year 11 costs a family far less than intervening late.
Canberra Tutoring has taught in this system since 2004. The teachers on staff have taught inside these colleges and know how the assessment calendar actually runs.
How an ACT ATAR is actually built, in four steps.
No other Canberra tutoring site publishes this arithmetic. A parent who understands it makes better subject choices in Year 10 than one who does not.
Step 1 — the course score
Each college calculates a course score for every T or H course from the student’s best 80% of unit scores. Course scores are not percentages: they typically fall between 30 and 105. Students are compared within a scaling group at their own college. Because the weakest fifth of units is discarded, roughly one unit in five can go badly without lasting damage — two cannot.
Step 2 — scaling across colleges
Other Course Score scaling brings results from different scaling groups and different colleges onto a common scale, using the ACT Scaling Test. Scaling changes the number a student receives; it never changes their ranking inside their own group. A student cannot be scaled below a classmate they finished above.
Step 3 — the aggregate
An Aggregate Score is the best three scaled major course scores plus 0.6 of the next best course score, major or minor. Four courses therefore matter, and the fourth matters at a discount — which changes how a Year 11 student should spend a limited number of study hours.
Step 4 — the ATAR
Aggregates are ranked across the territory and converted to an ATAR using a table supplied by the NSW Technical Committee on Scaling. That conversion is the reason an ACT ATAR is directly comparable with a NSW one, despite the two systems sharing almost nothing else.
The ACT Scaling Test, explained properly.
Year 12 students seeking an ATAR sit the AST over two days — the Tuesday and Wednesday of week 6 of Term 3, with a second sitting in week 2 of Term 4. Most parents have never been told what is in it.
Three papers
- Short Response — 2 hours, 19 to 25 questions requiring interpretation, explanation and justification.
- Multiple Choice — 2 hours 15 minutes, 80 questions grouped into units built on stimulus drawn from the humanities, social sciences, sciences and mathematics.
- Writing Task — 2 hours 30 minutes, a 600-word argumentative response to stimulus the student has not seen before.
A result is awarded only where a student makes a serious attempt at all three papers. Colleges run at least one trial AST, and students with Linguistically Diverse status are granted extra time.
Why the AST is misunderstood
An individual student’s AST result does not directly adjust that student’s own course scores. The AST moves the scaling parameters of every group the student belongs to. The test is a collective instrument, which is precisely why students under-prepare for it — the personal consequence is real but indirect.
The Writing Task is the most trainable part of the AST. Building a 600-word argument to a time limit, on unseen stimulus, is a taught skill. Canberra Tutoring treats it as one.
The AST is designed by the Australian Council for Educational Research — ACER, the same organisation that writes the scholarship tests many of these families sat for Year 7 entry. Those two papers reward the same habits of mind. Scholarship exam preparation and AST preparation are the same work, six years apart.
Moderation: your child is marked against a territory-wide standard.
The ACT moderates through Structured, Consensus-based Peer Review. Teachers from other colleges review portfolios of student work against system Achievement Standards, twice a year, usually in early March and August. Reviewers examine adherence to Board policy, the quality of criterion-referenced tasks and marking schemes, and teachers’ judgements against those standards.
March reviews Year 11 semester 2 work; August reviews Year 12 semester 1 work. Work a student produced in the second half of Year 11 is therefore still under review in March of Year 12.
The practical consequence for a parent: the standard a child is measured against is a system-wide standard, not one teacher’s preference. Knowing the published Achievement Standards for a course is worth more than guessing at what a particular teacher likes.
Course structure follows the same logic. A Standard Unit runs 55 hours across a semester. Most students carry five or six units a semester. A Minor is at least two units. Only T and H courses generate the scores used to build an ATAR — A and M courses count towards the certificate but not the ATAR.
The colleges we work with.
The ACT has run dedicated Years 11 and 12 colleges since separating from the NSW system in 1976. Roughly 4,800 students sit in Year 12 each year, about 2,800 of them seeking direct university entrance. Tutoring here means knowing these campuses by name.
Public colleges
Canberra College, Dickson College, Erindale College, Gungahlin College, Hawker College, Lake Tuggeranong College, Melba Copland Secondary School, Narrabundah College, UC Senior Secondary College Lake Ginninderra, and The Woden School.
Independent and Catholic
Daramalan College, Radford College, Merici College, St Edmund’s College, St Clare’s College, St Francis Xavier College, St Mary MacKillop College, Canberra Girls’ Grammar School, Burgmann Anglican School, Brindabella Christian College, Marist College, Trinity Christian School, St John Paul II College and Orana Steiner School.
Queanbeyan families, read this first. Students at Queanbeyan schools sit the NSW HSC under NESA, not the ACT Senior Secondary Certificate — even though some cross the border to attend ACT colleges. Nothing on this page about unit scores, moderation or the AST applies to an HSC student. See tutoring in Queanbeyan instead.
What the free assessment covers for a college student.
A full 60 minutes with a qualified teacher, in the family’s home, before anything is paid. For a Year 11 or 12 student that hour goes into the student’s actual unit scores so far, their college assessment calendar, and the gap between the marking criteria and what they have been handing in.
A written plan follows, and the family keeps it whether or not a lesson is ever booked.
No tutoring service can guarantee a unit score, a course score or an ATAR, and Canberra Tutoring does not. What is guaranteed is the same teacher every week, the full hour, and a plan in writing.
Every tutor and teacher holds a current ACT Working with Vulnerable People registration, and everyone who works across the border in Queanbeyan holds a NSW Working with Children Check as well — the two schemes are separate and neither covers the other. Ask for the number before the first lesson and it will be given to you.
ACT BSSS questions Canberra parents ask
What is a unit score?
A unit score is the mark a student receives for one semester-length unit of a T or H course, awarded by their college from continuous school-based assessment. A course score is then built from the best 80% of a student’s unit scores in that course, and typically falls between 30 and 105 rather than being a percentage.
Does Year 11 count towards the ATAR?
Yes. Year 11 units count fully. Because the ACT runs no external subject examinations, unit scores accumulate from the first semester of Year 11 and cannot be overwritten later. This is the single most common and most expensive misunderstanding among Canberra families.
What is moderation and can it change my child’s mark?
Moderation in the ACT is Structured, Consensus-based Peer Review: teachers from other colleges review portfolios of work against system-wide Achievement Standards, in early March and August each year. Moderation authenticates the standard a college is applying across its cohort. It is not a re-marking of one student’s individual paper.
Can you prepare my child for the AST?
Yes. AST preparation focuses on the Writing Task — a 600-word argumentative response to unseen stimulus in 2 hours 30 minutes — and on the reasoning technique the Short Response and Multiple Choice papers reward. Both are taught skills. The AST sits on the Tuesday and Wednesday of week 6 of Term 3.
How many units can we afford to drop?
A course score uses the best 80% of unit scores, so approximately one unit in five carries little weight in the final calculation. One badly disrupted semester is survivable. Two is not, because the second one can no longer be discarded.
My child is in a weak scaling group. Does that hurt them?
Scaling changes the number a student receives but never their rank within their group. A strong student in a weaker group is not pushed below a classmate they outperformed. What the scaling group affects is the parameters applied to the whole group, which is set by that group’s collective AST performance rather than by any one student.
When is the best time to start tutoring for the ACT system?
Early in Year 11. Because there is no external examination and course scores draw on units banked across two years, the cheapest effective intervention happens before the marks are recorded. By Term 3 of Year 12 most unit scores are already fixed.
We are in Queanbeyan and doing the HSC. Does this page apply?
No. Queanbeyan students sit the NSW HSC under NESA. Unit scores, ACT moderation and the AST do not apply to them. Canberra Tutoring tutors both systems — see the Queanbeyan page for the NSW pathway.
The short version
Why families pick us.
Named among Canberra’s best
One of five tutoring services named in Region Canberra’s guide to the best tutors in Canberra, updated December 2025.
Teaching here since 2004
Twenty-two years in this city — long enough to have taught in the same college a parent went to, and to know which primary schools run which reading programs.
Checked twice, not once
Every tutor and teacher holds a current ACT Working with Vulnerable People registration, and everyone who crosses the border to Queanbeyan holds a NSW Working with Children Check as well. Ask for the number before the first lesson.
Qualified teachers, not only tutors
Most tutoring in Canberra is delivered by university students. We field both, and the free assessment decides which one your child actually needs.
A second opinion behind every tutor
Every tutor is reviewed fortnightly by a qualified teacher on staff, so if something is not working it surfaces in a fortnight rather than at the end of term.
An hour before you spend anything
A full 60 minutes with a qualified teacher, at your kitchen table, and a written report you keep whether or not you ever book a lesson.