Ohio seems to have taken a page from Lake Wobegon, where all the children are above average. Last month, state officials releasing an early batch of test scores declared that two-thirds of students at most grade levels were proficient on reading and math tests given last spring under the new Common Core requirements. Yet similar scores on the same tests meant something quite different in Illinois, where education officials said only about a third of students were on track. And in Massachusetts, typically one of the strongest academic performers, the state said about half of the students who took the same tests as Ohio’s children met expectations…