Unlike other continuities of the school, Roméo Mécano's TV counterpart (Romeo) is not considered a student of the school.
The school is mentioned in "Gekko's Super Gekko Sense," when the PJ Masks said "PJ Masks, we played it cool, and in the night, we saved our school!"
In "All About Asteroids," Greg asks Newton Star which school he goes to, which could indicate that this is not the only elementary school in Tarabiscoville. This could also explain why the nighttime villains and Armadylan are never seen attending this school. However, Newton's biography on the PJ Masks site states he is from another city, and thus most likely goes to school there.