The Programme for International Student Assessment (PISA) is a triennial international survey which aims to evaluate education systems worldwide by testing the skills and knowledge of 15-year-old students. To date, students representing more than 70 economies have participated in the assessment.

Discover the  lastest set of results from the 2012 data collection (PISA 2012) focusing on mathematics

Around 510,000 students in 65 economies took part in PISA 2012 representing about 28 million 15-year-olds globally. More than 70 economies have signed up to take part in the test in 2015 which will focus on science.

The PISA 2012 assessment measured 15‑year‑olds’ proficiency in math, reading and science, the primary focus was on students’ capacity to reason mathematically and use mathematical concepts, procedures, facts and tools to describe, explain and predict phenomena, and to make the well founded judgements and decisions needed by constructive, engaged and reflective citizens.

http://www.oecdepublishing.org/multilingual-summaries/9789264201118-sum/html/9789264201118-sum-en.html

The whole document is available at the http://www.cmec.ca/en/ site.