两者的区别：do well in意思是在...成绩好；在...做得好；在...表现好，表示一种情况也可指在具体的一次活动中表现出色；be good at擅长...；善于...；在（某方面）出色，强调一种笼统情况。good只是形容词用来修饰名词，如果遇到动词必须用well来强调“好”。
be good at例句：I be good at association with person。我善于与人交往。A teacher should be good at drawing inferences about other cases from one instance。老师要善于举一反三。I knew it was something I was going to be good at。我知道那是我擅长的东西。
do well in例句：I guess I can do well in myself。我想我会做好我自己的。And I know you do well in maths。我知道你数学学得好。I must do well in the exams。因为我必须在考试中取得好成绩。
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