Language is related to Ability. Ability is related to Test. Examination is a type of Test. Examination is a synonym of Testing. 
Barrier is a type of Mechanism. Mechanism is related to Band. 
Language <--RelatedTo--> Ability <--RelatedTo--> Test <--IsA-- Examination <--Synonym--> Testing 
Barrier --IsA--> Mechanism <--RelatedTo--> Band 