假設你是李華，你的美國筆友Jack正在為即將到來的考試焦慮不已，嚴重影響了生活和學習，為此寫信向你求助．請你根據以下要點，用英語給他回一封信告知他你的建議．
1．制定復習計劃，樹立信心；2．堅持鍛煉身體；3．保持良好睡眠．
注意：1．詞數100左右；
2．可適當增加細節(jié)，以使行文連貫．
Dear Jack，

I am sorry to hear that you feel extremely nervous before an important exam．I'd like to give you some suggestions．
First，make careful plans before exams to master what you've learned completely．It will help you build up your confidence．Second，take proper exercise regularly，which will help you keep healthy and energetic．Last but not least，don't stay up late studying．It's very important to have a good sleep at night if you want to be energetic during the day．
I hope my suggestions can help you reduce the pressure of exams and perform well in them．

I am sorry to hear that you feel extremely nervous before an important exam．I'd like to give you some suggestions．
First，make careful plans before exams to master what you've learned completely．It will help you build up your confidence．Second，take proper exercise regularly，which will help you keep healthy and energetic．Last but not least，don't stay up late studying．It's very important to have a good sleep at night if you want to be energetic during the day．
I hope my suggestions can help you reduce the pressure of exams and perform well in them．

Yours，
Li Hua．