If one subgroup, such as minority students or students from low-income families, does not meet target test scores, then the entire school fails.
The legislation, titled the Federal Elementary and Secondary Education Act, measures improvement while the old program, ABCs of Public Education, shows overall accountability.
The passing of the law Jan. 8 surprised schools, giving them insufficient time to prepare, said Allen Strickland, superintendent of Hoke County Schools.
Now schools want to establish baselines for next year.
"There's a lot of details to work out in this county," he said.
The federal act also changed standards for teacher qualifications.
Schools now must have a fully licensed and certified teacher in every classroom, Strickland said.
To meet this demand, North Carolina needs to produce 10,000 teachers per year -- as opposed to the current 3,000 graduates, he said.
To ease the transition, he said, the state can use lateral entry for those who are working to get teaching licenses.