Mater Dei Prep High School, home of the Seraphs, is a private high school located in Middletown New Jersey. Mater Dei Prep High School is a part of the Shore Conference and has approximately 287 students and 21 varsity sports. Mater Dei Prep is an independent, faith-based college preparatory high school that fosters individuality and growth within an intimate and inclusive community. Our family is your family. Go Seraphs!