If the gains from 2006 to 2009 are duplicated when the PISA is next given in 2012, the goal of making 25-point gains in math and science will be met far ahead of schedule.

如果2006到2009年的成绩增长在2012年下一届PISA测试中重现，实现数学和科学上增长25分的目标将远远提前。

youdao

The Pisa survey is based on tests carried out in 2006 in 57 countries which together account for 90% of the world's economy.

BBC: RELATED BBC SITES

The PISA assessments of 15-year-olds show Wales falling further behind since the 2006 tests.

BBC: Children and Young People Committee