[2] In 2020, the St. Louis Order transferred ownership of the school to the St MacNissi's Educational Trust of the Diocese of Down and Connor.
[4] Besides the GCSE core subjects of English/English Literature, Mathematics, Religious Education and Science the following optional GCSE subjects are offered to pupils in Key Stage 4: Further Mathematics, Art & Design, Business Studies, Construction, Design & Technology, Drama, French, Geography, History, Home Economics, Information & Communication Technology, Irish, Music, Physical Education and Spanish.
In the 2018 Belfast Telegraph GCSE League Table, it was ranked joint first in Northern Ireland for its GCSE performance with 100% of its 2016/17 entrants receiving five or more GCSEs at grades A* to C, including the core subjects English and Maths.
[5] In the 2019 League Table, it was ranked joint ninth with 99.3 of its GCSE entrants being awarded five or more a* to C grades.
[6] In 2019 it was ranked First among secondary schools in Northern Ireland in terms of its A-level performance for the 2017/18 academic year.