cram school vs gymnasium

cram school

noun
  • A specialized school that trains students to meet particular goals, most commonly to pass the entrance examinations of high schools or universities. 

gymnasium

noun
  • A type of secondary school in some European countries which typically prepares students for university. 

  • A large room or building for indoor sports. 

  • A public place or building where Ancient Greek youths took exercise, with running and wrestling grounds, baths, and halls for conversation. 

How often have the words cram school and gymnasium occurred in a corpus of books? (source: Google Ngram Viewer )