What is Saint Joseph of Cupertino's prayer for those taking a test?

Prayer Before an Examination

to Saint Joseph of Cupertino O great Saint Joseph of Cupertino, who while on earth did obtain from God the favor to be asked in your examination only the questions you knew, obtain for me a similar favor for the examination for which I am now preparing. In return I promise to make known and cause you to be invoked through Christ, Our Lord. Amen. Saint Joseph of Cupertino, pray for us.