 The tests are marked by teachers hired by the IES.In 2018-19, IES operates 37 schools in Sweden with 26,800 students, mainly middle schools (grades 4-9), in Bromma, Borås, Enskede, Eskilstuna, Falun, Gävle, Gothenburg (Krokslätt and Johanneberg) , Halmstad, Helsingborg, Hässelby, Hässleholm, Huddinge, Järfälla, Jönköping, Karlstad, Kista, Landskrona, Liljeholmen, Linköping, Lund, Länna, Nacka strand, Skellefteå, Skärholmen, Sundbyberg, Sundsvall, Södertälje, Tyresö, Täby, Uppsala, Umeå, Årsta, Älvsjö and Örebro.The organisation also owns several schools in Spain and runs a school in the United Kingdom.