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Ms. Mahaley described the mother of a student at MLK Elementary School as a “huge hero” for raising a red flag when her son came home with test results “that she didn’t think were possible for her child.”

The boy explained that a teacher had provided answers and “coaching.”

“She reported that,” Ms. Mahaley said of the mother, “and that led to an investigation.”

At the charter school, a teacher and a proctor in the affected 3rd grade classroom left at the end of the 2010-2011 school year, although a school official said she did not know if their departure was related to the investigation.

Holly Cherico, the school’s marketing director, said it was “upsetting” to learn of the incident and they apologize to parents and students. The school has amped up its test security and training, she said.