About three months ago, Bill Nelson got an unusual phone call.
Nelson oversees data and assessment for the Agua Fria Union High School District in southwest Phoenix, Ariz. The call was from a former student, who left the district back in 2011.
He was "not quite a graduate," Nelson recalls. At the time, the young man had failed part of Arizona's high school exit exam, called the AIMS.
But in 2015, Arizona rescinded the AIMS requirement, and made that retroactive. So this former student was in luck.