CGPS meaning in Community ?

Columbia Grammar & Preparatory School ("Columbia Grammar", "Columbia Prep", "CGPS", "Columbia") is the oldest nonsectarian independent school in New York City, located on the Upper West Side of Manhattan (5 West 93rd Street). It was founded in 1764 by what is now Columbia University in order to properly prepare incoming freshmen in the fields of English, Greek, and Latin grammar. By 1865, the school had grown substantially and was no longer connected to the university.

The school was originally known as The Grammar School of King's College (King's College was the original name of Columbia University). The school changed its name concurrently with the university during the American Revolution to Columbia Grammar School, and added the word "preparatory" in 1969. While "grammar" and "preparatory" have differing connotations, the entire school is known by its full name.

The school has existed in several locations over the centuries. In 1907, the school moved to its current location on 93rd Street, off Central Park West. It originally consisted of one building, and expanded by adding five brownstones through the merger of the adjacent Leonard School for Girls in 1956. A building across the street was built in 1984, followed by two more in 1997 and 2001. An administration building was added to the school in 2009. In the past 20 years, the size of the graduating class has more than doubled from approximately 45 to approximately 125.