"There has been very little movement within the workforce, vacancy levels dropped to a 10-year low in 2010, and continue to remain relatively low."
PPTA Bay of Plenty chairwoman Rae Brown said some Bay educators found subject areas, such as maths, science and te reo, so difficult to staff classes were increasingly being taken by teachers of different backgrounds, through digital learning and correspondence. In some cases, te reo was removed from the curriculum.
Ms Brown said removing subjects from the curriculum because of teaching shortages was worrying.
"In some cases, correspondence can work quite well, but Maori is very hard to learn through correspondence, so some schools are being forced to drop it."
Ms Brown believed the ministry should record how many graduates sign up for the scheme but don't see out the three years.
"They expect us to record everything and report it to them so [the ministry] should do the same. How else are we to know whether the scheme is actually working?"
Ms Brown also thought there should be more scholarships made available to teaching graduates.
"If you train in maths and science, you can get much better-paid jobs working in the field with less hours and commitment, so no wonder they don't want to go into teaching.
"If there were guaranteed jobs for graduates and more financial support from the get-go, it could attract more people."
Labour's education spokesman Chris Hipkins supported the scheme but said it should be more closely monitored.