By Tim Willert, Staff WriterMore than 600 third-graders in the Oklahoma City school district have failed to prove they read well enough to earn promotion to the fourth grade as a state deadline for doing so approaches. Only five out of 611 district third-graders held back because they failed a state-mandated reading test in April have passed an alternative assessment since the start of August, prompting a district official to blame some teachers and principals for the lack of improvement. “These skills are being taught in some schools, and in some schools they’re not,” said Wilbur House, the district’s executive director of elementary curriculum. “I would say that some schools need to improve in reading instruction.” Students who failed the controversial third-grade test, and also failed to qualify for some type of exemption, have until Nov.Read more on NewsOK.com