Write a letter in at least 60 words according to the given situation(根据所给情景写一封不少于60词的信)
Suppose you are Joe. Your friend Betty is upset about a coming exam for she cares too much about the result. What do you think? Try to offer her some advice.(假设你是Joe，你的好朋友Betty因为过于在意考试结果而感到焦虑。请给他写一封信，谈谈你的看法，并给她一些建议。)
（注意：短文中不得出现任何人名、校名及其它相关信息，否则不予评分。）
