Continuity mistake: In the scene where Dewey and Ms. Mullins are in the bar, the shots from behind Ms. Mullins sitting down show that her left hand is on the table. However, the shots showing the front of Ms. Mullins show her arms folded.
School of Rock (2003)
Ending / spoiler
Directed by: Richard Linklater
Starring: Jack Black, Joan Cusack, Mike White, Adam Pascal
The principal and the parents find out Dewey is not a sub and he leaves before he gets arrested. The kids leave school, get Dewey and go to the Battle of the Bands. They sing a song Zach wrote himself, but they lose to Dewey's old band. The crowd cheers for The School Of Rock, and they play another song. Dewey winds up running his own rock-music lesson studio with Ned.
Keylime
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Trivia: The final sequence during the credits was all unscripted. Both the dialog and music solos were improvised.
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Answer: It is never said but If I was to guess, they got it from the guy he was pretending to be (Ned's) information from the school office.