73af6f5e_nguage_testing___Scales_Levels__Proficiency
[Level] 5 [Definition] Writing proficiency is functionally equivalent to that of a highly articulate educated native. There are no non-native errors of structure, spelling, syntax or vocabulary. Writing is both clear, explicit, informative, and imaginative. [Proficiency] 
Educated Native Proficiency
Language testing - Scales/Levels