ATARMAxxing
← All subject scaling
WACE Year 12 ATAR · Western Australia

Biology 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 Biology 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 Biology hub is 20 full-length model exams with mark-by-mark answer guides, revision notes, practice questions and flashcards, built for exactly that.

Preview Biology 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 Biology for life is $20 once, or $50 for any three subjects. See what's included →

What Biology actually asks of you

School assessment comprises Science inquiry 20%, Extended response 10%, Test 20% and Examination 50%. The external examination permits 10 minutes reading followed by 180 minutes working. Section One is 30 compulsory multiple-choice questions (30%); Section Two is 4–6 compulsory short-answer questions (50%); Section Three offers four 20-mark questions and requires one Unit 3 response plus one Unit 4 response (20%). The frozen model uses the 2025 raw structure: 30 + 100 + 40 = 170 candidate marks, while 210 marks are offered. Total 100 is the percentage column. Up to three calculators unable to create or store programs or text are permitted; no data or formula booklet is listed.

The 5 areas of study you are examined on

From the Biology ATAR Year 12 syllabus — for teaching from January 2024.

  • Unit 3 — Heredity
    Cell division, DNA replication and expression, mutation, variation and inheritance patterns explain continuity and diversity.
    In the exam: Trace mechanisms, solve inheritance probabilities and justify genotypes from evidence.
    Where marks go missing: Mitosis and meiosis have different products; probability is not certainty; epigenetics is not required.
  • Unit 3 — Biotechnology
    PCR, electrophoresis, sequencing, profiling and recombinant DNA provide evidence and practical applications.
    In the exam: Interpret controls, bands and sequence evidence and evaluate benefits, limitations and risks.
    Where marks go missing: PCR amplifies a target; gels separate fragments. A matching profile is evidence, not automatic proof of identity.
  • Unit 3 — Evolution and conservation
    Evidence supports common ancestry; mutation, selection, drift, founder effect and gene flow alter gene pools.
    In the exam: Calculate frequencies and distinguish random from selective processes when explaining change and speciation.
    Where marks go missing: Individuals do not evolve and organisms do not acquire mutations because they need them.
  • Unit 4 — Homeostasis
    Negative feedback and structural, behavioural and physiological adaptations maintain variables within tolerance limits.
    In the exam: Trace stimulus, receptor, control, effector and response; compare water, salt and temperature adaptations.
    Where marks go missing: Homeostasis maintains a range, not a fixed value; ectotherms also regulate behaviourally.
  • Unit 4 — Infectious disease
    Pathogen structure, life cycles, transmission, host density, movement and climate shape outbreaks and control.
    In the exam: Analyse epidemic data and evaluate quarantine, herd immunity, physical controls and antimicrobials.
    Where marks go missing: Phytophthora is treated as Protista in this syllabus; antibiotics do not treat viruses.

Full Biology 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 Biology practice examsTISC ATAR calculator

Questions

Does WACE Biology 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 Biology 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.

Keep going