Green Dale’s Prep School, or intermediate school (Years 3 and 5) is an integral part of the whole school. The 'Preppies' have their own space but take part in all the main School events, for example athletics sports, house music competitions and assemblies.

There are three classes in the Prep School - each class has a homeroom teacher and they also meet with subject specialists from the secondary school for art, science, food technology, languages, PE, and performing arts. To assure the continuity of education at Green Dale’s the Prep School teachers work closely with the senior Faculty Heads to develop their curriculum. Emphasis is placed on the core subjects: English, Mathematics, Science and Social Studies. Homework is avoided since the school emphasizes on class routines.

The classes have a maximum number of 30 students and are streamed to ensure that individual needs are catered for. The small size allows staff to get to know all the students in the department, creating a family atmosphere with a focus on being the best that is possible. There is an emphasis on providing quality programmers, by catering for different learning styles and needs. The Prep School has an open door policy.