After the Augustinians came the missionaries of the Congregatio Immaculati Cordis Mariae (CICM), otherwise known as the Congregation of the Immaculate Heart of Mary.

With the donations and help from the people of Belgium, Van Runckelen established the said school on June 27, 1917, and titled it after Saint Andrew, the patron of the parish.

Valenzuela made numerous developments to the school: the construction of a new building for the preschool and elementary departments, a new gymnasium, computer rooms, laboratories for physics, chemistry and home economics and other facilities.

In 1999, the preschool department, later dubbed as the Center for Early Childhood Education (CECE), was founded by Valenzuela and Gertrudes F. Bautista.

2000–2001)[5] Pope John Paul II created the new Diocese of Parañaque, an offshoot of the Archdiocese of Manila, on December 7, 2002.

In 2007, the school supported the Department of Education's project, Alternative Learning System Accreditation and Equivalency (ALS A&E), together with Pag-unlad ng Kabataan sa Kapatiran ni San Andres (PKKSA).

[7] The project fosters alternative education to out-of-school youths and adults in relation to the "Christian and missionary formation" of the school.

In 1976, he asked the English teachers, with the help of Odelia Cruz, to submit a poem about the school and that he composed the music for the chosen piece.

After several revisions, the hymn was completed on March 6, 1976, and it was taught to the graduating class for them to sing it on their commencement exercises.

Refrain: Hail St. Andrew's Endless fountain of wisdom We do pledge a life of serving love.