VCE Biology Scaling: Raw to Scaled (2026)
Biology scales up slightly. In the 2025 VTAC scaling report a raw study score of 30 scaled to 31.
What the 2025 VTAC report shows
Raw 30 → scaled 31
Study scores run 0–50, and VTAC's scaled study score can reach 55. This is the report's own conversion for a raw score of 30. It describes the 2025 cohort. Scaling is recalculated every year, so it is not a prediction of what your result will do.
How scaling works in Victoria
In Victoria, VCAA gives you a raw study score out of 50 for each study. VTAC then scales it. Scaling looks at how students in that study performed across all their other studies: if a study's cohort tends to do well elsewhere, the study is treated as more competitive and its scores are adjusted upward, and if the cohort tends to do less well elsewhere, scores are adjusted downward. The result is a scaled study score between 0 and 55. VTAC then builds your aggregate from an English study, which is compulsory, plus your three next-highest scaled scores, plus 10 per cent of a fifth and sixth scaled score. Aggregates are ranked across the state and converted to an ATAR. Scaling is recalculated every year, so it is never fixed.
Source: official VTAC scaling report (PDF). Last checked 2026-08-18.
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 scales up 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.
Questions
Does VCE Biology scale up or down?
Biology scales up slightly. In the 2025 VTAC scaling report a raw study score of 30 scaled to 31.
How does subject scaling work in Victoria?
In Victoria, VCAA gives you a raw study score out of 50 for each study. VTAC then scales it. Scaling looks at how students in that study performed across all their other studies: if a study's cohort tends to do well elsewhere, the study is treated as more competitive and its scores are adjusted upward, and if the cohort tends to do less well elsewhere, scores are adjusted downward. The result is a scaled study score between 0 and 55. VTAC then builds your aggregate from an English study, which is compulsory, plus your three next-highest scaled scores, plus 10 per cent of a fifth and sixth scaled score. Aggregates are ranked across the state and converted to an ATAR. Scaling is recalculated every year, so it is never fixed.
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.