Students at four schools in Bendigo will resit parts of NAPLAN because of disruption to connections during the online testing.
The Bendigo Advertiser understands Bendigo South East College was one of these schools.
The Victorian Curriculum Assessment Authority said the number of students to resit the test was still being finalised.
The Australian Curriculum Assessment and Reporting Authority said that disruptions to connections affected students in a number of schools across the country on May 14 while they were taking the test online.
This year was the second in which schools could choose to participate in the testing online.
This may have caused distress to a students, ACARA said in a statement.
Crusoe College, Weeroona College and Girton Grammar confirmed they were not affected by connectivity issues as their students sat the tests with pen and paper.
Catherine McAuley College Year 7 and Year 9 students took the NAPLAN test online, but experienced no connectivity issues, the school said. About 500 students at the school took the NAPLAN testing.
Crusoe College principal Brad Madden said participation was high in the NAPLAN testing at the school.
Parents can choose to withdraw their children from the testing.
Only eight students out of 150 at Crusoe withdrew from the NAPLAN, aside from those students who were exempt on their English speaking status, or learning disabilities.
Mr Madden said higher participation meant the school got more accurate data.
"We provided information to parents and tried to encourage everyone to do it, but there are some students their parents felt for a variety of reasons it would be best if they didn't do it, and that's their right to do that," Mr Madden said.
"If a student sits down and has a go of doing a test, for the best of their ability, it can show us across the board which areas of the curriculum generally we're strong in, and which ares we're not doing as well."
Mr Madden said the school had discouraged anyone from pulling out of the testing.
Likewise Leanne Preece, principal of Weeroona College said they encouraged students to participate because teachers find the data valuable in planning for numeracy and literacy learning.
Bendigo South East College, Victory Christian College and Marist College were contacted for comment.
Know more? Contact firstname.lastname@example.org.
Have you signed up to the Bendigo Advertiser's daily newsletter and breaking news emails? You can register below and make sure you are up to date with everything that's happening in central Victoria.