Alex Is Often Nervous During Exams, and Seems to Forget

Alex is often nervous during exams, and seems to forget everything during the test only to remember it hours later when he is relaxed. What would you recommend Alex do to improve his performance on exams?

A) Study for an exam when he is relaxed
B) Study for an exam when he is nervous
C) Study only the material he finds interesting
D) Study only the material he finds boring