In 1969, pre-university classes started and in 1978, "St Andrew's Junior College" was established and moved to Malan Road. By the 1980s, the Woodsville site was unable to handle the growth of both junior schools and the secondary cchool. Meanwhile, with nearby Potong Pasir developed, the school requested that a 4.18-hectare site allocated for education would be used for the "St Andrew's Secondary School". Construction of the secondary school started on 3 November 1984 and the buildings were opened in July 1986.