The schools chancellor has confirmed a massive grade-fixing scandal at John Dewey High School and has moved to fire the veteran principal for allowing dozens of students to earn credit for courses they never took. NY1's Lindsey Christ filed the following report.

An hour after Schools Chancellor Carmen Fariña released an explosive report on grade fixing at John Dewey High School, principal Kathleen Elvin cleaned out her office. After 32 years at the Department of Education, she's expected to be fired for letting students get credit for classes they didn't have to attend.

"Changing grades en masse for students who didn't deserve to have their grades changed. Giving students courses simultaneously, three of four courses simultaneously in a single class, often at lunch time," said Wade Goria, a teacher at John Dewey High School. "These sort of absurdities were taking place, and a number of very concerned and dedicated teachers said, 'No. This cannot continue.'"

Investigators say when they interviewed the principal, she "confirmed that students were not required to attend class or receive instruction in order to receive credit."

The report also found that students could take so-called "interdisciplinary" classes, in which students were supposedly being taught several subjects at once by one teacher.

Two assistant principals are also facing disciplinary charges.

Teachers blame the Department of Education for allowing the fraud to continue.

"It was well over a year until we finally got some decision," said Michael Klimetz, a teacher at John Dewey High School.

Since the investigation began in April 2014, the school has held two graduation ceremonies and given out dozens of diplomas to students who should not have graduated, including at least 15 of them last month. Officials plan to ask those graduates to voluntarily enroll in summer school.

As the investigation dragged on, Fariña repeatedly defended the slow pace and even suggested the allegations were false. But this week, she changed her tone.

"I take the charges very seriously," she said.

The DOE said all principals and superintendents will be re-trained on the protocol for giving class credit this summer.