Contractor is a type of Worker. Student is a type of Worker. Student wants (to) Learn. Learn is related to Gathering. 
Exam is a form of Examination. Exam is a form of Examine. Examine is a synonym of Analyze. 
Contractor --IsA--> Worker <--IsA-- Student --Desires--> Learn <--RelatedTo--> Gathering 
Examination <--FormOf-- Exam --FormOf--> Examine <--Synonym--> Analyze 