IELTS:
7.5 overall and not less than 7.0 in each of the 4 sections.
TOEFL Internet based (iBT):
Not less than 26 in each of the 4 sections; Paper-based 620 (with at least 4 in TWE); Computer-based 260 overall
IGCSE English (2nd language):
Grade A
Cambridge Certificate of Proficiency in English (CPE):
Grade B
Cambridge Advanced Certificate in English (CAE):
Grade A