The first Leaving Certificate students sat their examinations successfully in 1950. There were seventeen students in all, four of whom entered the religious life. In 1975 the school transferred from the Primary Branch of Education to the Post Primary Branch, thereby becoming a full Secondary School. At this stage the Department of Education merely supplied pre-fabs to cater for the growing numbers which had now increased to approximately 400 students and 32 teachers both lay and religious.

The Mercy order, diligent as ever, were determined to build a new school to facilitate their growing numbers and continue their efforts in the education of the students of Inchicore. With the help of past pupils, parents, residents of Inchicore and the surrounding area and the Department of Education, another milestone in the history of the school was reached in September 1985, when the new building was blessed by Most Rev. Dr. Joseph Carroll, Auxiliary Bishop of Dublin and opened officially by the then Minister for Education Mrs. Gemma Hussey T.D.

Sr. Anne Philomena was the first Principal in the Secondary School, followed by Sr. Agnes, Sr. Angela and Sr. Mary. In 1991 the first lay Principal, Mrs. Carmel Solon, was appointed. She was followed by Eamonn Corrigan in 2003 and Treasa Leahy who was appointed Principal in 2006.

The Catholic ethos of the Mercy order still prevails and will be a worthy legacy to future generations of people in Inchicore.

As part of teaching and learning in the 21st century excellent and exciting programmes have been introduced. Programmes like the Leaving Certificate Applied (LCA), the Transition Year Option (TYO) and Junior Certificate Special Programme (JCSP) have provided a more inclusive education for the student cohort. New teaching methodologies have been introduced.

Information Technology is a great source of assistance to the teacher and learner alike. Pastoral care continues to be a high priority and the introduction of Social Personal and Health Education (SPHE) on the curriculum allows for the girls to reflect and develop skills that will support them in the years ahead.
Other initiatives were introduced to support students completing school. These included Home work Clubs, Mentoring programmes, Soccer and Music are just some of the school activities that support teaching and learning in the school.

The achievements of our students are too numerous to list. They reflect the great work and are a credit to the co-operation between that the home, the school, the local community and the Mercy Order. We continue that work today meeting the challenges and needs of educating young women and facilitating their learning so that they have skills and knowledge necessary for the changing world today.