Have attained a level of proficiency of at least CLB 5 in either official language for each of the four language skill areas

International English Language Testing System (IELTS) – General Training – Test score equivalency chart
CLB LevelReadingWritingListeningSpeaking
108.07.58.57.5
97.07.08.07.0
86.56.57.56.5
76.06.06.06.0
65.05.55.55.5
54.05.05.05.0
43.54.04.54.0