Efforts to cleanup a massive mold problem at Manchester Township Middle School continue while students attend classes at the high school. 

Trucks helping to remove mold from Manchester Middle School (Dan Alexander, Townsquare Media NJ)

According to the district's web site, Superintendent David Trethaway says three quarters of the school's second floor has been tested and cleared.

They hope to reopen next month but he says they won't until they're 100 percent certain it's safe