Some of the nation’s top public universities are prodding dallying students toward the graduation stage, trying to change a campus culture that assumes four-year completion is the exception rather than the rule, the Washington Post reports. It’s a move supported not just by parents whose wallets are depleted by tuition bills. University leaders are pushing for on-time completion amid criticism over wasted tax dollars, spiraling tuition and America’s plummeting global rank in college attainment. Fewer than half of students graduate in four years at 33 of the 50 state flagship schools. The overall four-year graduation rate is 31 percent for public colleges and 52 percent for private ones, the federal government reported this year. The universities of Maryland and Virginia are among the exceptions, with on-time graduation rates of 63 percent and 85 percent, respectively. U-Va.’s rate is the highest among public flagship schools…