Math Center is a nonprofit organization that provides free help in math to children and young people in Sweden. Aimed primarily at secondary school students. Mattecentrum standing behind the Web service Matteboken.se, a free tool to study mathematics on the web. Matteboken.se covers math from grades 3 up to and including upper secondary course E and contains explanations on the torque in the text and in the video, exercises and a question forum. About 150 000 young people regularly study on Matteboken.se. Every year in May organizes Mattecentrum convention before national tests in mathematics in which secondary school students during an afternoon to practice along with volunteers from Matt Centre. 2013 was organized convention in Stockholm , Västerås , Uppsala , Lund and Gothenburg for a total of 1270 students [7] .