回複：親戚孩子想來美國讀高中

1.美國隻有私立高中發I-20,公立是不發I-20的是嗎?

yes

私立高中的I-20好申請嗎?

depends on school. good school=difficult; bad school=easy

需要些什麽材料?

depends on school. go to their websites or call them

2.讀高中需要過語言考試嗎(比如TOFEL或雅思)?

depends on schools. mostly ISEE or OLSAT; good schools also require interview normally. contact the school directly

3.美國這邊需要出擔保人嗎?

not necessary

4.讀高中的所有費用,包括TUITION,校外住宿生活費用等(我想美國高中很少有寄宿的吧)

depends on school. Good boarding schools normally > $40,000 a year.

no boarding normally $20,000 a year for good schools.

5.國內有什麽中介公司可以辦理這種全套出國手續或有什麽網站可以介紹這方麵的信息?

don't know about 國內 :-)