prep school 
noun
1British A private school for pupils between the ages of seven and thirteen.He was, briefly, the head teacher of a prep school in Surrey....
- My first job in the United States was as a schoolteacher - at a prep school in Virginia.
- He was preparing to attend a college prep school, something he had mixed feelings about.
2North American A private school that prepares pupils for college or university.
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- Begin, Menachem
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