Edited sentence: Deerfield Academy (Deerfield, Massachusetts).Georgetown Visitation Preparatory School (Washington, DC).Groton School (Groton, Massachusetts).Horace Mann School (Riverdale, New York).Hotchkiss School (Lakeville, Connecticut).Lawrenceville School (Lawrenceville, New Jersey).Mark's (Dallas, Texas).Phillips Academy (Andover, Massachusetts).Phillips Exeter Academy (Exeter, New Hampshire).Regis (New York, New York).The following is a ranking of the top ten preparatory schools in the United States: