The latest 8th grade test scores will not be released until Thursday, but school districts and state officials are already battling over what the results mean. An organization representing 24 metro-area school districts is accusing state officials of misusing and distorting the test scores to advance a political agenda. But state officials struck back today, defending their testing policies and their motives. Minnesota Public Radio's Tim Pugmire reports... This was the third year of 8th grade testing in reading and math...but the first every school in the state had to participate. Last year, about one third of all students tested failed, prompting a public outcry...a