The survey was conducted in 2003, 2005, 2007, 2008 and 2010-2011 in conjunction with TIMSS national assessment, as well as in 2012, 2014, 2015 and 2016. The test is administered and marked by schools. The test is administered and marked by schools. The survey is administered and assessed by NEC. The test is administered and marked by schools. The survey is administered and assessed by NEC.