Students from the ACT trailed Singaporean students in reading literacy by eight months, or the equivalent of 19 Program for International Student Assessment (PISA) points in the December 2016 results.
The ACT was Australia's best performing jurisdiction.
Australian students rank 17th in the PISA reading international league table.
But the results of ACT students (taken in isolation from the other states) are equal to the reading results of Japan - eighth.
ACT schools came top or equal top in 18 of 20 domains in the mid-2015 NAPLAN testing.
ACT results consistently outrank the national average in all 20 domains.
The ACT has ranked first or equal first in grammar and punctuation, and numeracy across all year levels since 2009.
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