With approximately 1200 pupils on roll, it is one of the largest secondary schools in Wales.
In its complex the school has a sixth form centre for post-16 education, a futuristic building which was designed to be energy efficient and environmentally friendly, it was opened in 1999.
Greenhill Orchestra has won the National Urdd Competition and got to the Music for Youth finals on several occasions and in July 2009 they came joint first.
It has two large gyms, seven tennis courts that double up as all weather playing spaces.
It also has an all-weather astro-turf for the school football and hockey teams, which see success in regional and national competition.