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The city has graded fourth to eighth grade math and English teachers for the past two years based on how their students performed on standardized tests.

The teacher's union is fighting to block the results from being released, arguing there are widespread mistakes in the reports.

United Federation of Teachers president Michael Mulgrew joined several local teachers Sunday as they voiced their concerns.

"What we now know unequivocally is this information that they're about to release is not reliable and for all different reasons: the broken tests, the unreliable formula that's still in early stages of development and the fact that the Department of Education has completely mismanaged the data inside of it and it's all wrong," Mulgrew said.

"It is damaging to my reputation and it is irresponsible for the City of New York to publish data they know is flawed when people's reputations are at stake," said city educator Deidra Corcoran.

Educators say errors in the report cards include the listing of wrong subjects, wrong students and even the wrong teachers.

"I teach math and science. My data report says I teach English Language Arts. Of the 30 students on my report, there are eight students that never stepped foot in my classroom. There are also 38 that I did teach that have been omitted from my report," said city educator Pamela Flanagan.

Schools Chancellor Joel Klein says of the 12,000 report cards, less than one percent of teachers found errors.

City lawyers also say taxpayers have the right to know how their money is being spent and how teachers are performing.

A judge will decide whether to make the teachers' grades public.

NY1 is one of several media outlets petitioning for the release of the grades.