P.S. 290 will have larger class sizes after the second grade was reduced from four to three classes.
Mayor Michael Bloomberg also dissed telecommuting as "one of the dumber ideas I’ve ever heard."
Class sizes rose across the city this year, the Department of Education said.
Money raised by the PTA goes toward reducing class size at the growing school.
Schools Chancellor Dennis Walcott said the city schools are not as overcrowded as critics fear.
Critics have slammed the mayor, who said he'd like to fire half the city's teachers to pay others more.
The Department of Education ranked P.S. 137 on East Broadway among the 20 lowest-performing schools in the city.
Mayor Bloomberg shot back at criticism of the city's education system and his handling of it on "Meet the Press" Sunday.
The city has nearly 1,000 more overcrowded classrooms this year than last year, the United Federation of Teachers said.
The teacher's union brought a suit saying the city mismanaged $760 million in state funds meant to reduce class size.
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