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WACE Year 12 ATAR · Western Australia

Computer Science Scaling WACE 2026: Does It Scale Up or Down?

TISC scales every WACE subject before an ATAR is calculated. The TISC scaling report is the authority on what this subject did.

Does WACE Computer Science scale up or down?

TISC scales every WACE subject before an ATAR is calculated.

TISC does not publish a per-subject raw-to-scaled conversion for this course in a form we can quote exactly, so there is no figure on this page — the direction above is sourced from the TISC scaling report linked below, and should be read as directional rather than numeric.

You can't change the scaling. You can change the raw mark.

Scaling is decided by your cohort, after the exam, and nothing you do moves it. The raw mark is the only part of this you control — and the Computer Science hub is 20 full-length model exams with mark-by-mark answer guides, revision notes, practice questions and flashcards, built for exactly that.

Preview Computer Science free →TISC ATAR calculator

The hub shows a sample revision note extract, one full exam question with its worked answer and the complete list of every exam and note title — no account needed to look around. Unlocking Computer Science for life is $20 once, or $50 for any three subjects. See what's included →

What Computer Science actually asks of you

Units 3 and 4 are assessed through school-based tasks (Project 40%, Theory test 10%, Practical test 10%, Examination 40% of the school mark) and one ATAR course examination (10 minutes reading time, 3 hours working time) that is combined with the moderated school mark. The examination has two compulsory sections weighted 40/60 of the exam mark regardless of raw marks: Section One - Short answer (20 questions on the 2026 cover, 83 marks, 70 minutes suggested, 40%) and Section Two - Extended answer (4 questions on the 2026 cover, 111 marks, 110 minutes suggested, 60%), with case-study stimulus in a separate Source booklet. The design brief allows 20-30 short-answer and 4-6 extended-answer questions, and raw marks change every year (94/110 in 2025, 108/87 in 2024). Permitted: standard writing items, up to three calculators that cannot store programs or text, Mathomat/Mathaid and a system flowchart template.

The Computer Science exam is Thursday 29 October 2026, 2.00 pm (3 hours working time (10 minutes reading time)). Source: WACE timetable.

The 6 areas of study you are examined on

From the Computer Science ATAR Course Year 12 Syllabus (for teaching from 2026).

  • Programming (Unit 3)
    Sequence, selection and fixed, pre-test and post-test iteration; integer, float, string and Boolean data; arithmetic, relational and logical operators and Boolean precedence; functions with parameters, local and global scope, pass by value and by reference; one- and two-dimensional arrays and dictionaries; linear and binary search, bubble, insertion and selection sort and their Big O; classes, objects, inheritance, encapsulation, abstraction and polymorphism. The exam asks for working Python and clear pseudocode, often on 2D arrays and dictionaries in unfamiliar scenarios.
  • Good practice, testing and debugging (Unit 3)
    The investigate-design-develop-evaluate framework, Gantt charts, linear vs iterative development, and good practice such as validating input, a clear mainline, one task per subroutine, stubs, version control, backups and exception handling. Testing covers unit, acceptance and live-data testing (large files, transaction mix, response times, load); debugging covers syntax, logic and runtime errors (division by zero, index out of range), breakpoints, print statements and trace tables.
  • Network communications (Unit 3)
    Compare the OSI and DoD TCP/IP models and the role of each layer; MAC-based switching at layer 2 and IP routing at layer 3; TCP vs UDP; ports, DNS and default gateways; IPv4 vs IPv6 and private vs public addressing; subnet masks, CIDR and subnetting; the PDU at each layer (data, segment, packet, frame, bits); routers, switches, modems, gateways, wireless access points and firewalls; Cisco-convention network diagrams with IP plans; ping and traceroute for troubleshooting.
  • Cyber security (Unit 4)
    External threats (phishing, DoS/DDoS, back doors, IP spoofing, SQL injection, man-in-the-middle, cross-site scripting, malware types, physical threats, zero day vulnerabilities) and internal threats (lost devices, compromised credentials, employee misuse), matched to solutions such as log analysis, anti-malware, firewall filtering, ACLs, intrusion prevention, VPNs, training, codes of conduct and physical security. Analyse incidents with the CIA triad and audit with the AAA framework; explain symmetric and asymmetric encryption, certificates, hybrid secure communication and red vs blue teams.
  • Ethics and law (Units 3 and 4)
    Impacts of software and developers' responsibilities (intellectual property, quality, responding to users, codes of conduct, ergonomics, inclusivity, privacy), plus the Privacy Act 1988, APP5, APP8, APP10, APP11 and APP12, and the Notifiable Data Breaches scheme, applied to supplied case studies about collecting, storing and securing personal data.
  • Data management (Unit 4)
    Entities, attributes and 1:1, 1:M and M:N relationships; primary, foreign and composite keys; insert, update and delete anomalies; ACID and open database connectivity; data dictionaries, crow's foot ER diagrams and relational notation; referential, domain and entity integrity and data quality; normalisation to 3NF; and SQL to create, modify and query tables, including constraints, cascading deletes, aggregates, GROUP BY, inner joins across up to four tables, calculated and concatenated fields and aliases.

Full Computer Science study-design guide →

How scaling works in Western Australia

In Western Australia, the SCSA moderates your school mark against the examination results, averages the moderated school mark and the examination mark 50/50 into a combined mark (a course with a practical examination combines each component 50/50 and weights the two as its syllabus states), and standardises it. TISC and the SCSA then scale every course at once with TISC's Average Marks Scaling: each course's mean scaled score is set to the mean its own students achieved across all their courses, so after scaling the mean of all scaled scores is 60 and a course mean above 60 has been scaled up. Your Tertiary Entrance Aggregate is your best four scaled scores plus 10 per cent of your Mathematics Methods, Mathematics Specialist and highest LOTE scaled scores, whether or not those courses are in your best four, to a maximum of 430; the ATAR is your rank on that aggregate against the whole Year 12 school-leaving-age population. Scaling is redone every year from that year's cohort, so a published scaled mean describes one past cohort and is never a guarantee.

What scaling is not

Scaling is not a difficulty rating and it is not a bonus. It compares how the students in one subject performed across every other subject they took, so a subject moves because of its cohort, not because of the paper. The consequence is practical: you cannot scale your way out of a weak result. The only lever you control is the raw mark, and the fastest way to move that is full-length timed practice against the real exam format.

WACE Computer Science practice examsTISC ATAR calculator

Questions

Does WACE Computer Science scale up or down?

TISC scales every WACE subject before any ATAR is calculated. We do not publish a figure for this subject; the TISC scaling report is the authority.

How does subject scaling work in Western Australia?

In Western Australia, the SCSA moderates your school mark against the examination results, averages the moderated school mark and the examination mark 50/50 into a combined mark (a course with a practical examination combines each component 50/50 and weights the two as its syllabus states), and standardises it. TISC and the SCSA then scale every course at once with TISC's Average Marks Scaling: each course's mean scaled score is set to the mean its own students achieved across all their courses, so after scaling the mean of all scaled scores is 60 and a course mean above 60 has been scaled up. Your Tertiary Entrance Aggregate is your best four scaled scores plus 10 per cent of your Mathematics Methods, Mathematics Specialist and highest LOTE scaled scores, whether or not those courses are in your best four, to a maximum of 430; the ATAR is your rank on that aggregate against the whole Year 12 school-leaving-age population. Scaling is redone every year from that year's cohort, so a published scaled mean describes one past cohort and is never a guarantee.

Should I choose Computer Science because of how it scales?

Scaling adjusts a whole cohort, not one student, so choosing a subject you will struggle in because it scales up is usually a worse trade than doing well in one that scales down. Check the prerequisites for the course you want first, then your interest and workload, and treat scaling as a tie-breaker. Scaling is also recalculated every year, so the figures in any report describe a past cohort rather than the year you are sitting.

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