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, ___________________________
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Yours truly,
Mr. Green
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