请你以心理医生Mr. Green的名义给Tom一些晚上更好休息以及如何放宽心态，积极备战的建议。要求通顺达意。字数在80-100词之间。
参考词汇: relax;  healthy;  happy;  confident (自信的)… …
Dear Tom,
I’m glad to hear from you. In my opinion, though the exam is very important,______________________________________________________________________
Yours truly,
Mr. Green