The medium of instruction in METU is English. However, for undergraduate programs, submitting an English proficiency score is not obligatory for the application. Those who satisfy one of the exam criteria listed below can submit their information to the Additional Certificates section of the application program. 

Admitted students who do not submit a valid TOEFL, IELTS or PTE ACADEMIC score during registration can take ODTÜ English Proficiency Exam. Those who do not satisfy the minimum score from this exam will attend English Preparatory Class at the Department of Basic English for one year.

Students who submit a valid English Proficiency Exam Result (TOEFL, IELTS, or ODTÜ English Proficiency Exam) during registration will be exempt from English Preparatory Class and will directly start their undergraduate courses.

Exams and the minimum scores accepted by ODTÜ:

http://oidb.metu.edu.tr/en/equivalence-table-english-language-exams-reco...