The then Western Region government, with external assistance from USAID (Harvard University) who provided staffing resources and Ford Foundation (who provided funding until 1973), established Comprehensive High School Aiyetoro in February 1963. It was a US Senator from New Jersey who proposed the establishment of Comprehensive High Schools in Nigeria and Kenya as a gateway of US influence in Africa. It was the product of US international diplomacy through Educational AID and the PEACE Corpse of the JFK Administration. The physical project was given to USAID to execute and to administer for the first five years, while the academic staffing and curriculum activities were given to Harvard University with counterpart matching staff from the Western Nigeria educational ministry. Comprehensive High School Aiyetoro quickly became a "Model School" in Nigeria and in the beginning years, many secondary schools would organize a short excursion visit to look at and to get a feel of the school on weekends. It was the first school in Nigeria to have one thousand or more students. It comprised Junior School starting at Form One and the Higher School of just 60 students, starting at the Lower Sixth Form and finishing with the Upper Sixth; and taking the Cambridge University Higher School Certificate Exam for University Admission. Hence Comprehensive High School Aiyetoro started with a duality educational system, whereby the sixth form followed the existing British System and Curriculum, while the Junior School followed the American System and Curriculum, and very notably in the "Modern Mathematics" curriculum. However, after few years the plan of the American SAT exams as the terminal exam for the Junior school had to be changed to WAEC. Hence curriculum changes and additional tutoring classes had to be provided to the first students to get to form four and five.