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The National Party is calling on Education Minister Steve Maharey to name five schools under investigation for National Certificate of Educational Achievement (NCEA) breaches.
The issue has come to light after Waverley High School's right to assess and credit NCEA students was suspended in December following allegations it coached students through answers and allowed them to cheat in order to boost grades.
The Taranaki school is now on the brink of closure.
The New Zealand Qualifications Authority has confirmed five other schools are under investigation for NCEA breaches, but won't identify them.
National Party education spokeswoman Katherine Rich said today parents had a right to know which schools were under the microscope.
"Parents with children doing NCEA have a right to know whether it's their school under investigation, potentially undermining the credibility of their children's NCEA marks," she said.
"Employers follow the progress of schools and when a school develops a reputation for being slack on assessment, it's the young person who strikes trouble when they look for work."
Mrs Rich said an inquiry was also needed to look into why it took so long for education authorities to deal with problems first signalled at Waverley High School in 2002.
- NZPA