by
Julia Gordon
,
17 August, 2026
Read 57 times
There's a question that comes up in almost every conversation we have with students who've just received a disappointing result: How many times can I sit the GAMSAT®? Can I sit again? The short answer is yes — and there's no cap on how many times you can do it. The GAMSAT has no official attempt limit, which is both reassuring and, if you're not careful, a trap.
Understanding the rules around GAMSAT® sittings — how often you can sit, how long your scores stay valid, and how universities actually use multiple results — is worth getting right before you start planning your next attempt. The logistics are relatively simple, but there are a few details that catch people out every year.
ACER's official position, stated clearly in the GAMSAT Information Booklet, is that there is no limit to the number of times an eligible candidate may sit the exam. So if you've sat twice, three times, or more, that's entirely within the rules. No strikes, no cooling-off periods, no lifetime cap.
The one restriction is that you can only sit once per test window. The GAMSAT® exam dates fall twice a year — in March and in September — and you're limited to one registration per cycle. You can't book two March sittings in the hope of cherry-picking the better day. One window, one attempt.
The exam calendar gives you two opportunities per year: the March sitting and the September sitting. For Australian applicants targeting graduate-entry medicine, the March sitting is the more strategically important of the two. GEMSAS — the centralised admissions system used by most Australian Medical Schools — opens for applications around May, which means GAMSAT® dates and the March results timeline align directly with the application window.
September sittings are useful, but come with a catch: results arrive after GEMSAS has already closed for that year's intake. A September score cannot be used in the same-year Australian application cycle. What it can do is position you well for the following year — and given that results are now valid for four years, a strong September sitting has real longevity. A lot of students we work with deliberately use September as a "bank" sitting when they know they're not quite ready to apply yet but want to lock in a score while they're deep in preparation.
Since ACER extended the validity period in late 2022, GAMSAT Results in Australia are valid for four consecutive years from the date of sitting. A score from September 2025 can be used for applications through to 2029. That's a meaningful runway — students who performed well early have the flexibility to apply across multiple cycles without needing to resit the GAMSAT® multiple times.
There is one exception worth flagging. The University of Sydney only accepts GAMSAT® scores from the past two years, regardless of ACER's standard four-year validity window. For 2027 entry, only sittings from September 2024 onward count at USyd. If you're targeting Sydney specifically and your best result is older than two years, you'll need to resit — so check USyd's admissions guide directly before assuming your score is still in play there.
Yes — and this is one of the most commonly misunderstood aspects of multiple GAMSAT® sittings. When you apply through GEMSAS, you select which GAMSAT® ID to submit. Universities only see the score you choose to send. A weaker resit does not automatically overwrite a stronger earlier result.
This matters more than most students realise. Many hold back from resitting because they're worried a lower score will appear on their application. That concern is understandable, but the system doesn't work that way. If your March sitting produced a score of 68 and your September resit came in at 63, you submit the 68 — the 63 stays invisible to admissions teams. The caveat is that medical school entry requirements vary by university, and some schools have specific policies around multiple submitted results, so read each admissions guide directly before you apply rather than assuming the rules are uniform.
You've Diagnosed What Went Wrong
The most common mistake students make across multiple GAMSAT® sittings is sitting again without changing anything about their GAMSAT Preparation. There's evidence behind this concern: research on repeat GAMSAT® performance shows that score gains between a first and subsequent sitting average around four points overall, and the gains diminish with each additional attempt after the second or third. If your preparation looked the same before your first sitting and your second, the result will likely look similar.
Resitting pays off when you can name specifically what went wrong and have a plan to fix it. That might be content gaps in Section 3 chemistry or physics, poor time management across a full exam day, or Section 2 essays that aren't landing. Reviewing GAMSAT example essays can make those writing issues easier to diagnose. Concrete problems have concrete solutions — but vague underperformance usually calls for a more structured approach to GAMSAT® preparation rather than more of the same solo study.
You're Timing It Strategically
GAMSAT® sittings also make sense when timed around your broader application readiness. Sitting during your penultimate undergraduate year as a genuine diagnostic run can work well, especially now that results are valid for four years. Some students deliberately sit in March of their second-to-last year to get a baseline, then spend the following twelve months targeting their weaknesses before their "real" sitting.
The trap is resitting reactively — booking the next available window because the last result was disappointing, without the preparation time to actually shift the score. Six months is enough time to follow a structured GAMSAT study plan if you use it deliberately. Six months of the same habits that produced the previous result almost never produces a different one.
GAMSAT® sittings cost increases every year. It's not a reason to avoid resitting when it's the right call, but it is a reason to make each attempt as prepared as possible. Sitting before you're ready is an expensive way to collect data you could have estimated from a solid GAMSAT practice test. If your mock exam scores are sitting well below the competitive range for your target schools, that gap is worth addressing before you book.
ACER does allow you to defer a registration to either the following March or September window if your circumstances change — but refunds after deferral have conditions attached, so read the registration terms before paying.
There's no limit on how many times you can sit the GAMSAT®. You can sit twice a year, in March and September. Results are valid for four years in Australia (two years at USyd and in the UK and Ireland), and when you apply through GEMSAS, you choose which score to submit — universities don't see the ones you withhold. None of that means sitting repeatedly without a plan is a good idea. The students who improve across GAMSAT® sittings are almost always the ones who changed something meaningful about their preparation, not just the ones who showed up again.
If you want to make your next sitting count, take a look at GradReady's GAMSAT preparation courses — built around diagnosing and fixing exactly the weaknesses that hold scores back.