Just ONE HOUR of TV or internet use each night can damage a child's GCSE chances, experts warn
Leading academic claims children should not watch TV if want to do well
Students dropped 2 grades in exams for every daily hour of TV or internet
Researchers found physical activity did not improve pupils results
Reading and homework radically improved performance of children
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http://www.dailymail.co.uk/news/article-3221819/Just-one-hours-TV-internet-use-night-damage-child-s-GCSE-chances-experts-warn.html
GCSE（General Certificate of Secondary Education）
全国統一試験制度