Singapore students have excelled in many of the world education benchmarks in maths, science and reading. In 2015, both its primary and secondary students rank first in OECD's global school performance rankings across 76 countries—described as the most comprehensive map of education standards. In 2016, Singapore students topped both the Program International Student Assessment (PISA) and the Trends in International Mathematics and Science Study (TIMSS). In the 2016 EF English Proficiency Index taken in 72 countries, Singapore place 6th and has been the only Asian country in the top ten.