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Continue to ChatInvestigating the validity of achievement and proficiency tests at Bilkent University school of English language - https://avesis.metu.edu.tr/yonetilen-tez/3cecb3f7-d1b2-4d1d-9070-7a9852512ea7/investigating-the-validity-of-achievement-and-proficiency-tests-at-bilkent-university-school-of-english-language