Which country really has the cleverest students?

Higher education has a strong sense of hierarchy.

And high-profile international league tables are a very public form of this pecking order.

While these might measure a whole range of factors – from reputation and staff ratios to research output – what they do not compare is the ability of students who have been taught in these universities.

But the OECD, in its annual Education at a Glance, has published test results comparing the ability of graduates in different countries.

Read more: http://www.bbc.co.uk/news/business-37649892