Which HSC subjects should my child choose for a high ATAR?

In NSW this decision is usually made in Term 3 or Term 4 of Year 10. Every winter, Sydney families study scaling tables as though Year 11 subject selection were a stock picking exercise. Scaling is real, and it matters at the margin. But it is the fourth most important factor in the decision, behind three that receive far less attention, and families who start with scaling often make the most expensive subject decisions.

It helps to know what the ATAR is built from. It is calculated from a student's best ten units of HSC courses, which must include two units of English, and each course's marks are scaled according to the academic strength of the students who took it. Scaling rewards a strong cohort, not a difficult syllabus. That distinction matters, because it means the scaling benefit of a course is only available to a student who can compete well inside that strong cohort.

The first factor is genuine aptitude. A student who would earn a Band 6 in a moderately scaled course will usually finish with a higher ATAR than the same student scraping a Band 4 in a highly scaled one. The scaling advantage is real, but it is usually smaller than the mark difference, and the mark difference is paid in full.

The second factor is sustainability. Year 12 is a long campaign, and the decisive work happens on ordinary evenings in Term 3 when nobody is checking. A subject the student actively enjoys is a subject they will study on those nights. A subject chosen only for its reputation is the one that gets pushed to tomorrow, every tomorrow, until the trial examinations make the cost visible.

The third factor is the pathway. Look up the actual university courses your child is considering and read what they assume or require. Most NSW university courses list assumed knowledge rather than strict prerequisites, but some do set prerequisites, and the difference matters: assumed knowledge can be made up with a bridging course, while a prerequisite cannot be wished away. Families often discover this in Year 12, when it is too late to add the course.

Only then does scaling enter the conversation, and usually to break ties rather than to lead. Between two subjects the student is equally strong in and equally committed to, the better scaled one is a sensible choice. Between a subject they love and a subject they merely tolerate, scaling rarely closes the gap. The fifth check is balance: lay the likely assessment calendars side by side and make sure the combination does not stack every major task into the same fortnight.

Two patterns cause most of the damage. The first is the capable student loaded with every highly scaled course, who spends Year 12 stretched across all of them and finishes below the ATAR a better balanced selection would have produced. The second is the opposite: a student steered away from a subject they are genuinely strong in because someone said it scales poorly, who then spends two years in a course they do not care about. Both are avoidable with an honest conversation in Year 10.

A practical tip for the conversation itself: ask your child to rank their current subjects twice, once by their marks and once by how much they enjoy them. Where the two lists agree, the choice is usually easy. Where they disagree sharply, that is the subject to talk through properly before the form is due.

Students must study at least twelve units in Year 11 and at least ten in Year 12, which leaves some room to carry an extra course into Year 11 and drop it later, and many schools allow changes in the first few weeks of Term 1, though the school's own deadline is the one that matters. Treat that flexibility as a safety net, not a strategy. At MA99, the subject conversation is part of every Year 10 diagnostic and is answered from the student's own work rather than from reputation, because the right list is the one your child can be excellent in and can sustain. The scaling will take care of itself.

Edward MaDirector, MA99 Education