SACRAMENTO — California education officials revised a list of troubled school districts Friday after erroneously identifying dozens of districts failing to meet federal academic performance guidelines under the No Child Left Behind law.

The change added 15 new school districts and removed 49 others from the list of districts needing improvement.

On Tuesday, state and federal officials reached an agreement on the criteria for evaluating California schools under the federal law. The U.S. Department of Education originally wanted changes that could have added 310 school districts to the watch list, but under the adopted method the state named 184 districts.

That list was revised down to 150 school districts after an error in calculations was discovered, state officials said Friday. The districts will have the chance to appeal their classification.

Districts become eligible for the watch list if annual performance goals aren't met across all grade levels in a subject area for two consecutive years.

The 150 districts will no longer be able to provide tutoring to students as a result of being designated for improvement. They will also need to develop improvement plans, and must make corrections by the end of the second year.