SAJC is an aided mission school which was started as a vision of faith when the Anglican Church took up the challenge of building a junior college in line with national educational developments in the 1970s.

SAJC had its origins as pre-university classes began in 1969 as part of Saint Andrew's Secondary School.

The campus is now located at the former Secondary School site at 5 Sorby Adams Drive, Singapore 357691 (previously as 55 Potong Pasir Avenue 1).

[citation needed] The crest was changed in 1993 to that of SASS to forge a united Saint Andrew's identity.

Classes, known as Civic Groups (CG) in the college, are named by the year the students came into the school, the faculty (A for Arts, S for Science) and a number.

[citation needed]The anthem and hymn were changed in 1993 to that of SASS to forge a united Saint Andrew's identity.

The PE attire consists of a white FBT-branded dry-fit shirt with the school crest sewn on the chest.

The college divides students into 5 Houses – Venn (black), Loy Fatt (yellow), Hose (blue), Gomes (red) and Romanis (green).

The school tie, which was worn by all students, was solid navy blue with one red and one white diagonal stripe across it toward the bottom.

[6] This serving as a reminder to both students and staff alike that each Saint has a divine purpose and plan set by God.

[8] The Hall is under the management of the Board of Governors of St Andrew's Junior College (SAJC) and it is also a member of the Anglican Diocese of Singapore.

Saint Andrew's Junior College offers both arts and science streams that leads to the Singapore-Cambridge GCE Advanced Level examination.

Subjects offered by SAJC:[9] Besides attaining academic success, students of Saint Andrew's Junior College also excel in co-curricular activities.