The ACT has closed a gap, with Indigenous and non-Indigenous students staying on until year 12 at the same rate.

The Productivity Commission says just over 93 per cent of Indigenous students in the ACT continued to the final year of school in 2016 - the same as non-Indigenous students.

Ten years ago, just 59 per cent of Indigenous students made it to year 12.

But the report also shows there is plenty of work to be done, with a gap of about 10 per cent remaining in ACT NAPLAN results between Indigenous and non-Indigenous students.

That figure is similar nationwide, but the ACT does not have regional or remote students, who influence the average in other states and territories.

The ACT is also the only jurisdiction to show a decline in the proportion of year four students passing national literacy standards since 2011 — both Indigenous and non-Indigenous.

The ACT also spends about $4,000 more per secondary student than the national average.