O.W.L.s and N.E.W.T.s
Ordinary Wizarding Levels are examinations Hogwarts students take at the age of fifteen. Each fifth year student has a consultation with Professor McGonagall to discuss career paths. This prepares the students for their tests and helps them understand the results they need to acheive. Harry, Ron and Hermione sat their O.W.L.s during June of their fifth year.
Nastily Exhausting Wizarding Tests are examinations taken by Hogwarts students in their seventh year. These examinations have an impact on the type of career the student may have later in life.