ATLANTA (AP) — America’s eighth graders are falling behind in math and reading, while fourth graders are doing slightly better in reading, according to the latest results from the Nation’s Report Card . But there were some exceptions to the findings, which also showed declines among fourth graders in math. Mississippi and the District of Columbia showed gains, along with some other big-city school districts. Nationwide, a little more than a third of eighth graders are proficient in reading and math.