The Australian Curriculum Assessment and Reporting Authority said in a statement that a number of students undertaking the online assessment on May 14 experienced disruptions to connectivity.

Schools affected by the glitch have been offered the opportunity to resit tests by paper format on May 28.

Wagga Christian College parent Heidi Combs said her daughter, in year 9, experienced regular interruptions during the online writing assessment.

"The whole cohort of students had regular, but very short interruptions during the test; it was like the computers would stop and think and students would be typing out a sentence to look up and find only half of it was there," Ms Combs said.

"It would have been quite disruptive to the generation of ideas and the flow of writing, especially in a creative writing test.

"I think it's been a learning experience as it's a different testing environment and in some ways it's a good introduction to what the future holds for testing and I think it's given my daughter a bit of a heads up."

Ms Combs questioned whether the writing component of NAPLAN should be digital.

"From a parents perspective, it needs to be consistent across all schools; either online or on paper," she said.

"I think for the other NAPLAN tests, like spelling, comprehension and numeracy, they suit online because they allow for better, shorter sentences, but with writing it tests so many other skills.

"Are you testing their computer and typing skills or their ability to have ideas and write them down?

"I'm also often concerned about how much screen time children are getting and I get mine to write down their homework as there's heaps of evidence that shows writing on paper retains information," she said.

Ms Combs said her daughter has chosen to re-sit the test, despite it coinciding with an inter-school touch football competition.

The college's principal Phillip Wilson said he still supports NAPLAN and online testing, despite students in years 5, 7 and 9 experiencing disruptions.

"Our feedback with NAPLAN is that our school had some minor interruptions, but we were nowhere near as bad as other schools," Mr Wilson said.

"I understand that very few of our students have opted to resit the test.

"I'm not worried about next time and I appreciate the effort they're making to ensure it is as fair as possible and the results are as accurate as possible."

Mr Wilson said the school has has not received any complaints from parents and argued this was because the school ensures communication and downplays the stress associated with NAPLAN.

National Education Standards Authority, the test administrators for NAPLAN in NSW, said they do not release names of individual schools or students resitting the tests.

A spokesperson from The Riverina Anglican College said students were not affected this year, because the school continued with the paper format of the NAPLAN test.

Similarly, Mater Dei said they had only "very minor" technical issues, which did not impact students.

A spokesperson from the Catholic Diocese of Wagga said a number of schools have experienced connectivity issues and some students will resit the test.

"While the technical issues have been regrettable, there are no plans to revert to a paper-based test," the spokesperson said.