Hardest HSC subjects in 2026 (and what 'hard' actually means)

There is no official list of "hardest" HSC subjects. What can be measured is how strong each course's students are (UAC's scaling report) and what each course demands (NESA's syllabus and exam specifications). This page uses both. It does not rank courses by how hard they will feel to you, because no data can tell you that.

What "hard" can mean

• Cohort strength. A high scaled mean means you are competing against students who do well across all their courses. UAC's 2025 report is the latest data.
• Content. How abstract or cumulative the syllabus is.
• Workload and independence. Some courses hinge on a long independent project rather than an exam.

The courses

Mathematics Extension 2

• Cohort: 3,844 students in 2025; scaled mean 43.4 per unit, the highest of any course with 500+ students.
• Content (2017 syllabus, examined in 2026): proof (including further induction), vectors in three dimensions, complex numbers, further integration and applications of calculus to mechanics. There is no conics topic; that belonged to the old 4 Unit course.
• Syllabus change: a new Mathematics Extension 2 syllabus (2024) starts with Year 12 in Term 4 2026 and is first examined in the 2027 HSC.

Mathematics Extension 1

• Cohort: 9,279 students; scaled mean 39.7.
• Content: Year 12 covers proof by induction, vectors (including projectile motion), trigonometric equations, further calculus and differential equations, and the binomial distribution, on top of Year 11 work on polynomials, inverse functions and combinatorics.

English Extension 2

• Cohort: 1,423 students; scaled mean 35.8.
• Assessment: there is no written HSC exam. The external assessment is the Major Work (40 marks) and Reflection Statement (10 marks).
• Length limits (NESA): short fiction and creative non-fiction 5,000 to 6,000 words; critical response 4,000 to 5,000 words; poetry up to 3,000 words; scripts no more than 25 minutes; podcasts no more than 15 minutes; multimedia 7 to 8 minutes. The Reflection Statement is limited to 1,500 words.
• Why it's hard: a year of largely self-directed work, with most of the mark resting on one piece.

History Extension

• Cohort: 1,777 students; scaled mean 32.7.
• Assessment: a 2-hour written exam (50 marks, two 25-mark extended responses: one on historiography, one on your case study), plus a school-assessed History Project essay of no more than 2,500 words with a bibliography.
• Why it's hard: you design your own research question about changing historical interpretation and have to argue about how history is written, not just what happened.

English Extension 1

• Cohort: 3,691 students; scaled mean 36.1.
• Assessment: a 2-hour written exam worth 50 marks, split between the common module and your elective, each requiring a sustained critical response.

Chemistry and Physics

• Cohorts: Chemistry 10,369 students, scaled mean 32.0; Physics 8,817, scaled mean 31.0.
• Content: Year 12 Chemistry covers equilibrium and acid reactions, acid/base reactions, organic chemistry and applying chemical ideas. Year 12 Physics covers advanced mechanics, electromagnetism, the nature of light and "from the universe to the atom". Both mix calculation with extended explanation.

Music 2 and Music Extension

• Cohorts: Music 2, 762 students, scaled mean 34.1; Music Extension, 447 students, scaled mean 35.9.
• Why it's hard: a high level of performance or composition skill is assumed before you start.

Latin

• Cohorts: Latin Continuers, 140 students, scaled mean 40.5; Latin Extension, 80 students, scaled mean 42.3.
• Note: cohorts this small move around from year to year, so treat one year's figure with caution.

Software Engineering

• Cohort: 1,768 students; scaled mean 26.7.
• Why it's on lists: it replaced Software Design and Development and was first examined in 2025, so there is only one year of past papers and scaling data.

Hard is not the same as good for your ATAR

UAC's percentile data shows why. In 2025:

• A median Mathematics Extension 1 student scaled to 41.5; a bottom-quarter (25th percentile) student scaled to 36.6.
• A median Mathematics Advanced student scaled to 33.2; a 90th-percentile Mathematics Standard 2 student scaled to 37.3.
• A median Chemistry student scaled to 33.9; a 90th-percentile Biology student scaled to 39.9.

Where you finish inside a course matters as much as which course it is.

Choosing for 2026

1. Check university prerequisites and assumed knowledge first.
2. Be realistic about your position in each cohort, using Year 11 results and teacher advice.
3. Account for workload. Extension 2 and History Extension projects take time from every other course.
4. Use scaling as a tie-breaker.

See also our HSC subject selection guide, how HSC subjects are scaled and the highest scaling HSC subjects. You can test subject mixes with the HSC ATAR calculator.