英语作文：假如你是Jim,你的同学Mary总是担心她的学习,导致睡眠不足.请你根据上面的内容,给她写一封信,针对她的问题,说说你是如何做的,并给她提出两点建议,最后提出你的希望.字数80词左右

Dear Mary, I heard that you often become sleepless because of worries about your performance at school. In my opinion, this is really unnecessary. I also hope that I can always do very well at sch...