While applying to Harvard Business School's MBA program, applicants must submit two letters of recommendation. International students with undergraduate degrees taught in languages other than English must provide TOEFL, IELTS, PTE, or Duolingo scores. However, these test scores are recommended but not required if your graduate degree was not taught in English. No minimum GMAT or GRE scores are required, as the school has no preference for either exam, but it does accept both. The average core MBA course size is 93 students, and students typically have around five years of work experience. Fall enrollment deadlines are September 4 and January 6, and the application fee is $250.