A majority of the nation's teenagers, including two out of every three blacks, thinks public school scholastic requirements are too easy, a Gallup Poll has found. About 90 percent of those surveyed said teachers and school administrators should be tested every few years to see if they are keeping up with new developments in education. The poll, conducted for the Charles F. Kettering Foundation of Dayton, found 66 percent of the blacks, compared with 53 percent of whites, critical of light workloads. The overall findings were similar to those of a poll conducted a year ago. Dr. John M. Bahner of the foundation said one interpretation of the findings is that schools don't set expectations high enough and students don't work up to potential because courses are not relevant to their lives. "Educators should reexamine their curricula," he said. Dr. Scott Thomson of the National Association of Secondary School Principals called the findings "a hopeful sign that young people are aware of the larger world and are saying, 'Hey, I gotta get prepared' for the challenges, including the tough economy and world scene. "As they look ahead, they see, unlike the kids of the '70s, that they can't just depend on God and the United States government to provide," he said.