Hi,
As a junior, I went to a school called The Inkwell, a little Protestant Church of Ireland school that backed ..
--- I'm not sure what he means by "junior" Does it mean that he was still going to primary school, but as far as I know the author was 12 years old then.
In my experience, 'a junior' is not a natural way to refer to someone in a context like this. I'd have trouble figuring out exactly what he means.
Best wishes, Clive