In 1971, the St. George Secondary School enrolled its first students drawn mostly from the surrounding feeder schools. Among these were students who had been at home for a year because, in those days, students finished school at age 13. The school opened in 1972 while construction was still in progress and on the completion of construction, and after three subsequent intakes, the school was officially opened on 28th November, 1974 by the Honourable L. Erskine Sandiford, Minister of Education.
The junior boys wore khaki and the senior boys, dark brown pants and beige shirts. The junior girls wore lilac overalls and white blouses while the senior girls wore lilac skirts and white blouses. Presently, the junior boys continue to wear khaki, while the senior boys wear grey pants and a white short sleeve shirt, which has the school's crest printed on the left breast pocket. The junior girls wear a kelly green tunic with a school belt and a white blouse, while the senior girls wear a pleated kelly green skirt, the school belt and a white blouse which has the school's crest printed on the left breast pocket. Male and female Upper fifth students wear a school tie with no crest printed on the white shirts.
The first principal was Mr. K.G. Alleyne and his deputy was Ms. Linda Jemmott. The school’s roll quickly grew to more than 1000 students with class size varying from 30-34 students. The principal and his staff laid a sound foundation which was distinguished by the following characteristics:
- A high level of discipline.
- A strong academic performance.
- Excellent management/ staff relations supported by robust discussions.
- A strong ethic of care for both staff and student.
- A vibrant and successful athletic culture.