The crossword solutions for the term 'arduous exam' are ORAL, which is a four letter word. An arduous exam is a difficult test that requires a lot of effort and time to complete. It usually involves a lot of studying and preparation in order to pass. ORAL exams are a type of arduous exam where the student must answer questions orally in front of an examiner. This type of exam can be particularly challenging as it requires the student to think quickly and articulate their answers clearly.