Which HSC Subjects Count Towards Your ATAR If You Study More Than 10 Units?

If you study more than ten eligible HSC units, UAC uses your best two scaled English units and your best eight scaled units from the remainder to calculate your ATAR. You do not nominate the course to leave out, and your lowest trial percentage does not necessarily identify it.

The important distinction during the 2026 exams is between a result that might not enter the final aggregate and a course you can safely stop completing. Those are different questions. Before making any change to an enrolled course, speak to your school.

Check eligibility before choosing units on paper

UAC’s current NSW eligibility requirements include satisfactory completion of at least ten Board Developed HSC units, with two English units, three courses of at least two units and four subject areas. A subject area can contain several courses.

That is why counting course names alone can mislead you. English Advanced and English Extension are different courses within English; adding another English course does not create another subject area.

Eligibility establishes whether your completed pattern qualifies. The later selection of scaled units establishes which results contribute to the aggregate. Check both questions with your school, particularly if your studies include extension courses or results completed in another year.

An illustrative twelve-unit pattern

Imagine a straightforward pattern containing two eligible English units and five other eligible two-unit courses. This gives twelve units in total. The English units count, and the strongest eight scaled units from the other ten fill the remaining places.

In this simplified example, one of those five non-English courses would be excluded from the aggregate. It would not be chosen by comparing the headings on school reports or deciding which subject is supposedly the easiest.

This illustration contains no invented scaling factors and represents no individual student. Patterns containing one-unit or extension courses need more careful checking, because “drop the worst subject” is an imprecise shortcut.

Why trial percentages cannot settle the question

The aggregate uses scaled marks. UAC’s explanation of unit selection shows why the course with the lowest reported HSC mark need not be the excluded course. Raw school percentages are even less suitable for making that decision in advance.

Think about the information a trial result actually provides. It shows how you performed on that paper under those conditions. It can reveal unfinished sections, weak knowledge or a successful method. It does not tell you precisely how all your final course results will compare after the remaining assessment processes.

Use a low trial result to choose revision tasks. For instance, if most lost marks came from interpreting supplied data, practise that skill. Treating the same mark as proof that the entire subject is irrelevant throws away the useful part of the feedback.

Extension mathematics needs its own check

Under UAC’s rules, Mathematics Extension 1 is one unit alongside Advanced, but two units alongside Extension 2. When both Extension 1 and Extension 2 are satisfactorily completed, Mathematics Advanced is not also included in the ATAR calculation.

If a calculator appears to reject your course combination, check its instructions before changing marks or selecting a different course to force an answer. A tool’s input rules can be reflecting the official combination requirements.

Keep preparing for every enrolled exam

Do not skip a paper because an estimate suggests it will not count. NESA’s 2026 rules require students to sit their entered exams, subject to the stated illness and misadventure provisions. Missing an exam can have consequences beyond the mark you hoped to discard.

You can still make sensible choices about study time. List the exams remaining, their dates and the specific skills needing attention. Give each paper a preparation plan, then spend extra time where useful improvement looks achievable. This is more defensible than allocating no preparation to a subject on the strength of an uncertain prediction.

Before changing your approach, ask your school: “Does my pattern meet the eligibility rules, which course combinations need special treatment, and what would happen if I did not complete this course?” Bring your actual course list so the answer can be specific.

If you need help prioritising subject practice, contact North Shore Tutors about private tutoring focused on your remaining exams.

Guidance checked on 15 October 2026. Confirm current requirements with NESA, UAC or your school as relevant.