As a world-class, accredited private school in Cambridge, Massachusetts, ISB is home to 540 students from age 2 through Grade 12. ISB places the development of the bilingual brain at the heart of our mission. ISB students graduate with an American high school diploma and choose between two internationally renowned diplomas, the French or the International Baccalaureate, allowing them to thrive at leading universities in the United States, France, and worldwide.