TOEFL For international students, a TOEFL exam is required unless you have a bachelor’s degree from a U.S. university. The requirement is not waived for the TOEFL if you earned only a master's degree or Ph.D. from a U.S. institution. Have your TOEFL scores sent to the GIAC by the ETS testing center. The TOEFL is valid for 2 years. If you took the TOEFL more than 2 years ago, your score has expired and you will need to re-take the exam. The minimum scores considered acceptable for admission by the Graduate School are: TOEFL: 79 on the Internet-based test (iBT) GRE Results from the general GRE test are required. Have your GRE scores sent to the Graduate & International Admissions Center (GIAC) by the ETS testing center. GRE scores are valid for 5 years. If you took the GRE more than 5 years ago, your scores have expired and you will need to re-take the exam.