Exam-phobia (Examophobia)
Like any other kind of phobias to have an unnecessary fear of exam. Over-thinking about exams that makes you get nervous.
Sue: I'm really nervous about tomorrow's exam.
Sarah: oh come on it's a piece of cake, I'm sure you have got exam-phobia (examophobia)
Sarah: oh come on it's a piece of cake, I'm sure you have got exam-phobia (examophobia)