The middle school of the RIS international program encompasses Key Stage 3 of the English National Curriculum, catering to students aged 11 to 14. During this phase, students build upon and deepen the knowledge acquired in Key Stage 2, while preparing for more complex academic challenges in Key Stage 4, including the GCSE exams.

At Key Stage 3, students begin to specialize in subjects that play a critical role in their educational journey. At RIS, they study English, mathematics, physics, chemistry, biology, history, geography, as well as French or German. The curriculum also includes business studies and ICT, ensuring a well-rounded education and comprehensive preparation for future academic challenges.

English serves as both an independent subject and the primary language of instruction. Proficiency in English is essential for mastering all subjects. Students develop communication skills, learning to express their thoughts clearly, argue their ideas, and ask insightful questions to enhance understanding. Additionally, the program helps improve vocabulary and negotiation skills, critical for success in both academic settings and real-life situations.

The learning process also focuses on developing critical thinking, encouraging students to form hypotheses and explore various ideas, fostering their overall intellectual growth.