This year's eighth graders scored better than those of years past on the Basic Skills Tests in reading and math. The tests are Minnesota's first step toward tough graduation standards. The class of 2000 must pass the tests to get a diploma. A passing grade is 75-percent or better. State officials say the scores show schools are making needed improvements but there is a lot of work yet to do. Minnesota Public Radio's Tim Pugmire reports... Statewide, 68-percent of the 8th graders tested in February passed the basic skills reading test, up from 59-percent last year. In the math test, 71-percent passed, up just one percent from a year ago. Bob W