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 Level Reading Writing Listening Speaking
10 8.0 7.5 8.5 7.5
9 7.0 7.0 8.0 7.0
8 6.5 6.5 7.5 6.5
7 6.0 6.0 6.0 6.0
6 5.0 5.5 5.5 5.5
5 4.0 5.0 5.0 5.0
4 3.5 4.0 4.5 4.0