It means that the children have mother-tongue or near-native competence in both English and French. The school also offers some support to help students coming from abroad who need to accelerate their proficiency in French.
Pupils are required to follow a rigorous academic programme comprising grade-level language instruction in both French and English. The programme follows the normal French secondary school curriculum, plus additional hours for English language and literature as well as History and Geography. Children must be capable of speaking, reading, and writing in both English and French at a level expected of other children of their age or year in school.