Where was st Judes school that song for a raggy boy based on?

The song "Raggy Boy" isn't based on a specific school called St. Jude's. There's no real-life St. Jude's school directly connected to the song's creation. The song's setting is a fictional depiction of a harsh and impoverished boys' school, likely drawing inspiration from general experiences and perceptions of such institutions in Ireland during the time period when the song's lyrics were written.