P.S. 39 The Henry Bristow School (Brooklyn, NY). Prekindergarten (PK) has played an important role at PS 39 for more than two decades. From its inception our PK program has consisted of two full-day programs and follows the universal PK model where each class has a maximum of eighteen students and is led by one classroom teacher and one paraprofessional. Our PK curriculum is social/emotion learning and inquiry based. Teachers integrate Blocks/Construction, Science/Discovery, Art, and Dramatic Play activities throughout the day to provide authentic opportunities for children to gain literacy and math skills, explore new concepts, express themselves, and make connections to their lives in meaningful ways.