Middle School (Royal International School) executes Polish core curriculum and the substantive and methodological British core curriculum (National Curriculum). Students of middle school are taught in grades 1-3, according to the Polish educational system and the program corresponding to the British level teaching Key Stage 3 (12 years old).
Middle School Royal International School continues its education within the Science Club, Art & Design Club and the Economy Club, which topics are chosen in such a way so that they support the teaching of biology, physics and chemistry as well as subjects of social science. Middle school students also continue their education based on the methodology PBL, which means that the part of their lesson contains interdisciplinary projects on a chosen topic.
Middle School is also the time for the conscious shaping of citizenship, that is why the students implement charity projects in their education and take grass-roots initiatives aimed at improving the diagnosed problems.