One expert is joining the calls to overhaul NCEA after the Government indicated changes were on the way.

A damning report's highlighted major problems with the qualification's credibility, with some schools already withdrawing from Level One.

NZ Initiative Senior Fellow Dr Michael Johnston says NCEA's had a 20-year run and it's time to rethink it.

"I think a lot of teachers and schools have probably had a gutsful of it, to be honest. It imposes a very heavy workload on teachers... there's a lot that schools have to do."

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