ISAT Scores

Understanding ISAT scores:

ISAT is an admission test required as one component of entry applications to a selection of high-stakes university courses. ISAT is specifically designed to rank a highly competitive and intelligent population of candidates, so it is important to look at the scores received within this context.


  • The scoring process is complex and requires substantial development and analysis by ACER's psychometricians. Candidates cannot calculate their own scores. The ISAT scaled scores are developed as a complex interaction between candidate abilities and test item difficulties (Item Response Theory: IRT)
  • ISAT scores for Critical Reasoning (CR), Quantitative Reasoning (QR) and Overall are on scales with ranges of 100-200.
  • The use of scaled scores enables scores from the test in different years to be directly compared. (The Overall score is an average of the CR and QR scaled scores).


  • To give meaning to the scaled scores, percentile ranks are also provided.
  • Percentiles (%ILE) show the percentage of candidates whose scores are lower than the one reported.


A student with an Overall score of 183 has a percentile rank of 81, meaning that their score is higher than that achieved by 81% of others taking the test. The candidate is thus within the top 20% of the test-taking population.

Critical Reasoning

Quantitative Reasoning














Over the years, percentile ranks will change as different candidates take the test. However, the ISAT scores will remain comparable, as they are anchored between test forms and across years.