YBM/SISA, founded in 1961, generates more than 400 million dollars ($US) revenues annually combining our publishing division, education division and testing division. YBM is the official publisher of National Geographic magazine in Korea and is also the official test administer for the TOEIC Exam as well as the Microsoft Office User Exam.  YBM is the largest and most well-known education-based corporation within Korea offering career opportunities with advancement throughout its various divisions.