Founded in 1854, Poly Prep is a Nursery-12th grade independent school operating on two campuses (Park Slope & Dyker Heights) in Brooklyn, NY. Poly Prep is a Nursery-Grade 12 independent school operating on two campuses (Park Slope & Dyker Hei College preparatory day school that continues to honor the mission of the school's founders, providing an outstanding academic program and a strong, supportive community for the city's brightest and most promising young men and women.