你这里问的所有问题都没有固定的答案，都是因孩子而异的，

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顶级寄宿学校都配有升学顾问。不过毕竟一个人不可能Cover那么多人，你可以选择找学校的或者额外校外请一个。现在像我们国内的机构和顾问都是中美导师配置，在美国也有办事处，所以界限也比较小。也是为了最终能有好的产值---名校录取结果嘛~

Schools in US prefer students to have the followings:
-High level of English
-Good grades
-Good test scores
-Outstanding extracurricular activities
-Good interview
-Good essays

You need to keep closely in touch with your child's advisor so that you are aware of what is going on in your child's life. This way you can also alert his host family if something needs attention. Yes, you will need a counselor for high school to follow the academics/extracurricular that your child is doing, as well as applying to college - preferably someone who has studied in the US before.

看个人需求，呵呵

你好！
我是LEAP的导师Christina Lin,很高兴能为您解答。

如果学校里的升学顾问很不错了的话就不用在校外聘请了。至于校外顾问聘请华人顾问还是老外顾问我觉得主要看家长的英语水平和感觉，毕竟和华人顾问可能更容易沟通