When I was at Oxford College of Emory (about 2 years ago), students who had fulfilled Oxford’s academic requirements and the requirements of Emory College or Goizueta were allowed to leave Oxford and attend Emory College or Goizueta.
People would fulfill Oxford’s academic requirements after only 3 semesters with AP credits, summer classes or by overloading their coursework (taking more than 4 courses per semester).