http://www.theguardian.com/education/2013/dec/03/uk-students-education-oecd-pisa-report
Wonder how NZ has fared relative to 2009?
Edit: http://www.nzherald.co.nz/education/news/article.cfm?c_id=35&objectid=11166346 But rankings don't match the Guardian table (OECD countries only I guess)