The DOE estimates nearly 7,000 students take classes in trailers. Advocates put the number much higher.
The state's Education Department won't send student data to inBloom's online portal.
Class sizes rose across the city this year, the Department of Education said.
A total of 670 schools have overcrowded classes this fall, the United Federation of Teachers said.
The city has nearly 1,000 more overcrowded classrooms this year than last year, the United Federation of Teachers said.
Schools Chancellor Joel Klein stepped down Tuesday and will be replaced by Hearst magazines executive Cathie Black.
More than 700 elementary and middle schools received lower grades this year compared to last year.
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