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How Many Times Can You Sit the ISAT?
If your first ISAT sitting doesn't go the way you hoped, the natural next question is whether — and how soon — you can try again. The short answer: there's no lifetime cap on how many times you can sit the ISAT, but ACER enforces a strict 12-month waiting period between attempts, and every prior result you've sat stays visible to universities. Here's what that actually means for your application strategy.
There's No Official Limit, But There Is a Waiting Period
ACER, the test's official provider, doesn't publish a maximum number of times you can sit the ISAT over your lifetime. What it does enforce is a mandatory gap of 12 months between sittings — so if you sat ISAT on 10 April 2026, you're not eligible to re-sit until after 10 April 2027. In practice, this makes the 12-month rule the real constraint on how many attempts you can realistically fit in before an application deadline, rather than any fixed cap on total attempts.
You'll also need to submit a fresh registration and pay the registration fee (currently AUD $435) each time you sit, since arrangements are only valid for the specific test window and year you registered for.
What Happens If Two Results Land Within 12 Months
Because registration itself enforces the 12-month spacing, this scenario is rare — but ACER's policy is clear on what happens if a test taker somehow ends up with two results less than 12 months apart: the more recent sitting is cancelled, and the universities you nominated are notified. This is designed to prevent test takers from "topping up" a result too quickly rather than genuinely improving over a full preparation cycle.
Universities Can See All Your Attempts
This is the detail most students underestimate: if you sit the ISAT more than once, universities aren't shown only your best or most recent score — they can access every valid result in ACER's database for you. Since results remain current for two years from the date you sat them, it's entirely possible to have two separate, still-valid scores on file at once if you resit after the 12-month gap. There's no mechanism to withdraw or hide an earlier attempt.
What This Means for Your Strategy
Because you can't quietly discard a weak first attempt, and because a resit costs you a full 12 months, the ISAT rewards going in properly prepared the first time rather than treating an early sitting as a low-stakes practice run. If you do need to resit, use the full 12-month gap deliberately: revisit where you lost marks, address section imbalances (Critical Reasoning versus Quantitative Reasoning), and sit further timed practice tests under real exam conditions before booking your next window.
It's also worth factoring the 12-month rule into your timeline early. ISAT runs in four test windows a year, but because you can only sit once every 12 months regardless of window, choosing your first sitting date should already account for whether you might need a second attempt before your application deadline.
Get It Right the First Time
Given the cost of a resit — both in time and in having a lower score permanently visible alongside your best one — it's worth approaching your first sitting with a genuine plan rather than treating it as trial and error. Fraser's ISAT program is built around a diagnostic-first approach specifically so students walk into their first sitting prepared, rather than banking on a second attempt.
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