alma mater vs cram school

alma mater

noun
  • A school, college or university from which an individual has graduated or which he or she has attended. 

  • A school's anthem or song. 

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. 

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