FILE - In this Nov. 7, 2013 file photo, South Korean students cheer their seniors' success in the Scholastic Aptitude Test in front of the main gate of an examination hall in Seoul, South Korea. 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). The group tests students worldwide every three years. (AP Photo/Ahn Young-joon, File) FILE - In this Nov. 7, 2013 file photo, South Korean students cheer their seniors' success in the Scholastic Aptitude Test in front of the main gate of an examination hall in Seoul, South Korea. 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). The group tests students worldwide every three years. (AP Photo/Ahn Young-joon, File)
FILE - In this Nov. 7, 2013 file photo, South Korean students cheer their seniors' success in the Scholastic Aptitude Test in front of the main gate of an examination hall in Seoul, South Korea. 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). The group tests students worldwide every three years. (AP Photo/Ahn Young-joon, File)

Diligent Asian students dominate global exam

FILE - In this Nov. 7, 2013 file photo, South Korean students cheer their seniors' success in the Scholastic Aptitude Test in front of the main gate of an examination hall in Seoul, South Korea. 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). The group tests students worldwide every three years. (AP Photo/Ahn Young-joon, File) FILE - In this Nov. 7, 2013 file photo, South Korean students cheer their seniors' success in the Scholastic Aptitude Test in front of the main gate of an examination hall in Seoul, South Korea. 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). The group tests students worldwide every three years. (AP Photo/Ahn Young-joon, File)
FILE - In this Nov. 7, 2013 file photo, South Korean students cheer their seniors' success in the Scholastic Aptitude Test in front of the main gate of an examination hall in Seoul, South Korea. 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). The group tests students worldwide every three years. (AP Photo/Ahn Young-joon, File)
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