The school you are looking for was called the Deal College for Boys. The original school was called the Alfred House Academy, founded in the 18th century.
Later, the Deal College became a boarding school for the sons of gentlefolk, the principal being James R Lush, five times Mayor of Deal.
The building was to become the Lloyd Memorial Home, or Caxton Seaside Home, for retired printers; later for convalescent policemen.
The College building (not the original Academy, which stood on the same site) still stands at the bottom of Alfred Square at the junction of High Street and College Road; it is now called Lloyd Court and is a block of flats.
If you can get hold of a copy of "Old Deal & Walmer" by Gregory Holyoake (pub. Meresborough Books 1989, ISBN 0905270401) it has pictures of the inside of the building when it was a convalescent home.