High Quality Content by WIKIPEDIA articles! The Singapore American School is a private international school in Singapore. Established in 1956, the school offers an American-based curriculum from preschool through to Grade 12 for approximately 3,700 expatriate students, making it the largest international school in the world. Approximately two-thirds of the students at SAS are United States citizens, with the rest of the student body comprising more than 50 nationalities. Few Singaporean students attend the school as Singapore government regulations prevent most local students from attending international schools within the country. This is because international schools have limited openings with priority given to international students.