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