FILE - In this March 10, 2010 file photo, a student, who successfully passed the entrance examination of University of Tokyo, gets a congratulatory toss as the result of Japan's most prestigious university exam is announced at its campus in Tokyo. Students from Shanghai, Hong Kong, Singapore, Taiwan, Japan and South Korea were among the highest-ranking groups in math, science and reading in test results released Tuesday, Dec. 3, 2013 by the Program for International Student Assessment (PISA) coordinated by the Paris-based Organization for Economic Cooperation and Development (OECD). In Japan, the government added 1,200 pages to elementary school textbooks after its children fell behind in those in rivals such as South Korea and Hong Kong in 2009, although Japan’s scores for 2009 were tops for rich industrialized countries. Japan has since improved its standings in all three areas. (AP Photo/Itsuo Inouye, File)