In 2012 Fatima Girls & St Mary’s Boys Schools were combined to create the biggest primary school in Ireland. 1100 boys and girls in 36 classrooms. Imagine how loud it is during the breaks! If you can't imagine, ask the neighbors.
To avoid cache proximity to the school, and situations when geocachers may feel uncomfortable whilst looking for the cache or how teachers, security staff or parents may react to seeing people around an area where there are children and who might appear to be acting in a manner that may be considered suspicious cache is placed in some distance from the school. It's even more visible from that perspective how big it is.
Cache is very accessible and recommended for beginners.