Montessori de Oro ( MdO) began as a preparatory school for four to six year olds in 1980. It was founded by Mrs. Dolores Herrera Reyes, the present Directress of the school. It has expanded into a kindergarten, elementary and secondary school since then. Montessori de Oro is a non-sectarian and co-educational school imbued with Filipino national ideals, Christian principles, and humanitarian values. Its high school department focuses on three aspects. First, it prepares the students to cope with college life by providing the necessary competence and skills.