That figure equates to more than one in four of 15-year- olds in the 34 OECD nations.
Analysis of results from the OECD PISA study of education around the world between 2003 and 2012 revealed yesterday that few countries have seen improvements among low performers and nearly as many have seen their share of low performers increase.
In some countries, 50 per cent of students were falling behind in at least one of the key subjects.
And the wealth of a country need not be the main factor.
"It is education policy and practice that can help students clear this bar, not just per capita income," the report says.
The danger to countries' future economic health cannot be underestimated - students who perform poorly aged 15 face a high risk of dropping out of school and when a high proportion of the population does not have basic skills, "long-term economic growth is severely compromised".
It found that all of the countries could improve pupils' performance, providing they take the necessary steps.
The OECD's first recommendation is that countries must prioritise reducing the number of low-performing students, using a "multi-pronged" approach.
For example, remedial support must be provided as early as possible in a struggling child's school career.
There is also an onus on governments to identify low- performing schools and attribute greater funding as quickly as possible.
Germany, which last year took in more than a million people fleeing war and poverty, recently brought in a specially-tailored programme of language learning for immigrant pupils.
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