假如你是李华，你在美国的朋友Mandy给你写了一封信征求意见。请根据这封信的内容给他回一封信。

Hi Li Hua, As an ordinary middle school student, I plan to study abroad some day, but when is the properer time, before or after graduation from college? And what should I prepare before I go abroad? Best wishes. Mandy

注意：1. 词数100左右；
2. 可适当增加细节，以使行文连贯；
3. 开头和结尾已为你写好。