About the National Center Tests: New style University administered tests started in the spring of 2006 under a new course of study. ” Cram and prep schools suggested that students who have already graduated should take math and science tests under the new course of study because they believed they would be easier” “Spokemen of cram and prep schools said current seniors may have been at a disadvantage because some universities would ignore the current course of study in the 2nd entrance exams, to be held at the universities they apply for. The same could be said for entrance exams at private schools that did not participate at the national center test.” Source: Yomiuri Shimbun