Nadeak, B. and Naibaho, L. 2020. THE EFFECTIVENESS OF MASTERY LEARNING TECHNIQUE ON IMPROVING STUDENTS’ ABILITY IN COMPLETING ENGLISH NATIONAL EXAMINATION. International Journal of Research -GRANTHAALAYAH. 8, 2 (Feb. 2020), 57–62. DOI:https://doi.org/10.29121/granthaalayah.v8.i2.2020.184.