Researchers say North Carolina’s Read to Achieve literacy program has had no gains with five years of test scores showing little benefit.

The Charlotte Observer reported Monday that North Carolina State University released a study last week over the third-grade reading campaign the state has spent more than $150 million on. It found the program was too focused on third grade and that having each school district implement it leads to inconsistencies from teacher skills to the type of summer reading camps offered.

State Superintendent Mark Johnson and other officials say the study doesn’t show that the program should end. They say they’re working to improve it as summer camps have been expanded to first- and second-graders, testing has been reduced and schools are doing more to work with parents.