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Sciences

Science Extension

1
UNIT
What this subject builds

Science Extension is a real research project — you design, run and report a study.

Independent research
Designing and delivering an original scientific investigation.
Analytical reasoning
Statistical reasoning and critical reading of research.
Writing & expression
Writing a formal scientific research report.
Full skill profile
Writing & expression
Argument & persuasion
Analytical reasoning
Numeracy & modelling
Practical & lab craft
Independent research
Creativity & making
Detail & recall
Filled dots = how strongly this subject develops each quality. What do these mean?
Effort & difficulty
INTENSITY
High
TYPICAL LOAD
3–5 hrs/wk

A self-directed research course on top of a HSC science — light on content, heavy on independence.

Where students struggle

Scoping a feasible project and the statistics behind it.

Who it suits
Tends to thrive
Confident science students who want to do real research.
May find it a grind
Students who want structured content to revise from.
How it scales
Scaled mean (per unit)
32.0 / 50
3-YEAR STABILITY
Very stable
Scaled mean by year: 2023 32.2 ±0 2024 32.2 −0.2 2025 32.0
0 10 20 30 40 50 mean 32.0

This is the spread of scaled marks across everyone who took the subject — not how hard it is. A high mean usually means a strong cohort sat it. The figures are from UAC’s latest scaling report (2025), with the year-by-year trend above.

862
sat it in 2025
58.8%
female
99.75
highest ATAR
Mark explorer

Where might my mark scale to?

Set the HSC mark you’re aiming for. We’ll show a band of where that tends to scale — never a single number, never a prediction.

Expected HSC mark 42 / 50
203550

Your exam mark, out of 50 — a 1-unit course.

A mark in the low 80s tends to scale to roughly
37–40 per unit / 50
Scaled marks are measured per unit, out of 50 — the standard UAC scale. There’s no exact conversion, so this is a zone, not a pinpoint.
0 10 20 30 40 50 mean 32.0
There’s no exact HSC-to-scaled conversion. Scaling depends on how the whole cohort performs each year, so treat this as a feel for the range — not a calculator.
Common questions
How does HSC Science Extension scale?

In the UAC Preliminary Report on the Scaling of the 2025 NSW HSC, Science Extension had a scaled mean of 32.0 out of 50 per unit, and its scaled mean has been very stable over recent years. Scaling reflects how academically strong the cohort is — not how hard the subject is — and there is no exact HSC-to-scaled conversion, so it's best read as a range, never a single number.

How hard is HSC Science Extension, and how much work is it?

Science Extension is high effort — typically 3–5 hrs/wk. A self-directed research course on top of a HSC science — light on content, heavy on independence. Where students most often struggle: Scoping a feasible project and the statistics behind it.

What does HSC Science Extension build?

Science Extension is a real research project — you design, run and report a study. It especially develops independent research, analytical reasoning, and writing & expression.

Who should take HSC Science Extension?

Confident science students who want to do real research. It may be more of a grind for students who want structured content to revise from.

Where’s this data from?

Scaling figures are from the UAC Preliminary Report on the Scaling of the 2025 NSW HSC (Tables A1, A3). Scaled marks are out of 50 per unit.

There is no exact HSC-to-scaled conversion — for any one HSC mark there is a range of scaled marks, which is why we only ever show a band.

The skills, effort and “who it suits” notes are Intuition Education’s editorial guidance, not UAC data.

Why we don’t do an ATAR calculator →
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