Under the education reform movement started in the early 1990s by many state legislatures and the federal government, about two-thirds of the nation's public high school students are required to pass a graduation exam, usually at the 10th and higher grade levels, though no new states had adopted a new requirement in 2006. This requirement has been an object of controversy when states have started to withhold diplomas, and the right to attend commencement exercises, if a student does not meet the standards set by the state.