Weighted vs unweighted GAMSAT score

ACER names the sections rather than numbering them, which causes recurring confusion because Written Communication is now sat first chronologically. The official numbering used in the results formula is: Section 1 Reasoning in Humanities and Social Sciences, Section 2 Written Communication, Section 3 Reasoning in Biological and Physical Sciences.

ACER’s own explanation is straightforward: the double weighting “was undertaken from the inception of the test and reflects the importance of minimum levels of science proficiency required in graduate medical studies” Peer-reviewed. The same source states plainly that at least one school does not apply it.

The weighting also compounds an effect from the underlying distributions. Section 3 has by far the widest spread of the three — a standard deviation of 10.51 against 6.05 for Section 1 — so it already separates candidates more than the other sections do. Doubling it makes Section 3 the dominant variable in the overall score.

All three candidates below have an identical unweighted mean of 62.67. Under ACER’s weighting they are five points apart.

Candidate A gains 1.83 points from the weighting; Candidate C loses 3.17. Now put the same three candidates in front of three different admissions offices.

22 of the 33 institutions in our dataset use ACER’s weighted overall. The 11 below do not, or do not say University-published.

Melbourne states it verbatim: it “does not use the GAMSAT ‘overall score’ in selection”. Queensland is equally explicit — “UQ uses an unweighted GAMSAT score (an average of the three sections rounded to six decimal places)”. Both Notre Dame campuses use the unweighted mean, and ScotGEM is the only non-Australian institution confirmed to depart from ACER’s 1:1:2.

That last point matters for a UK applicant. ScotGEM’s published cutoff of 50 is an unweighted 50, so it is not comparable with any weighted figure at another UK school.

Sydney’s MD and DMD use neither the weighted nor the unweighted overall. Candidates are ranked on their individual section scores, and the combination formula is deliberately unpublished. Sydney also refuses to publish historical thresholds: “Threshold GAMSAT scores from previous years are irrelevant to the current admission cycle and will not be published or provided.”

One internal exception: Sydney’s Master of Pharmacy does use an overall score, with a minimum of 55.

Wollongong requires 50 overall and 50 in each section, and then stops using GAMSAT entirely. Neither GPA nor GAMSAT is ranked; the interview rank is 50% Casper and 50% admissions bonuses. For a Wollongong application, a 51 and a 75 are worth the same — which is a genuinely useful thing to know before paying to resit.

Tasmania, Ulster, Sunderland, Worcester publish an “overall score” requirement without ever stating whether it is weighted or unweighted Never stated. We show these against ACER’s default because that is the published convention, and we flag them rather than filling in a plausible guess. If you are applying to one of them, ask the admissions office directly — the difference can be several points.

All four Irish schools use ACER’s weighted overall, and they have no choice: ACER forwards only the best Overall Score to the CAO, so an Irish school cannot re-weight what it never receives.

Because Irish medicine has no GPA points system — a 2H1 is a pass/fail gate, and a First is worth exactly the same — the GAMSAT overall alone ranks candidates, with ties broken by random number. That makes Section 3 half of the single number that decides an Irish offer, with no section floors and no academic component to offset it. It is the highest-leverage variable in the entire Irish system.

Expect our figures, and anyone else’s, to land within a few tenths of the number on your Statement of Results rather than on it exactly. Every competing calculator presents its output as definitive. It cannot be.

Our score calculator shows both the weighted and unweighted figures side by side, with the universities that use each.