In what conditions there is exemption from proof of English proficiency?

Applicants might be exempt from certifying their English proficiency under the following conditions only: Applicants, who have completed an undergraduate or a graduate program in our university, are exempt from English proficiency requirement, as long as they apply to a graduate program in our university within at most two years of graduation from our university. Also, English proficiency level of citizens from countries where English is the official language will be determined via an interview at the School of Foreign Languages (YADYOK in short), and a written exam if necessary.