The cause for O'Sullivan's visit was that in 2009 16 students of Mathematical Grammar School were admitted to University of Cambridge. Two were female, and both received full scholarship from Trinity College, Cambridge, while in 2010 15 students enrolled in Cambridge, 7 of whom received full scholarships from Trinity College. Policy of scholarship granting of Trinity College of University of Cambridge allows maximum of 2 full scholarships per world regions (such as North America, or Europe, or Africa, or Indochina, etc.), and Mathematical Grammar School excellent score caused exceptions in Trinity's policy year by year, and caused O'Sullivan to pay a visit to MGB.