Arborvitae Plains Montessori, Inc. APMI School offers: Early Childhood Education Junior Advanced Casa (Nursery) Senior Casa (Kindergarten) Advanced Casa (Preparatory) Grade School Grade One to Six Business High School First to Fourth Year ?EXPLORE? is APMI?s Summer Program wherein Advance and Remedial courses in major subjects,Speed Reading and Easy Spelling, Computer Discovery for Kids and Math Enhancement are offered to preschool, grade school and high school students.