现在几乎所有的美国大学都承认雅思成绩，所以就不用考虑雅思成绩的适用范围问题了。
参考资料：
http://www.eduers.com/studyabroad/不好意思，我是学商科的，只知道商科的情况，发给你作为参考吧。
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关于商科排名，你可以上USNEWS上面看看，那的排名因该是最权威的。
以下是商科TOP20：
1 Harvard University Boston, MA
Score
100
1 Stanford University Stanford, CA
Score
100
3 University of Pennsylvania (Wharton) Philadelphia, PA
Score
95
4 Massachusetts Institute of Technology (Sloan) Cambridge, MA
Score
93
4 Northwestern University (Kellogg) Evanston, IL
Score
93
4 University of Chicago Chicago, IL
Score
93
7 Dartmouth College (Tuck) Hanover, NH
Score
89
7 University of California--Berkeley (Haas) Berkeley, CA
Score
89
9 Columbia University New York, NY
Score
88
10 New York University (Stern) New York, NY
Score
84
11 University of California--Los Angeles (Anderson) Los Angeles, CA
Score
83
12 University of Michigan--Ann Arbor (Ross) Ann Arbor, MI
Score
82
13 Yale University New Haven, CT
Score
80
14 Cornell University (Johnson) Ithaca, NY
Score
79
14 Duke University (Fuqua) Durham, NC
Score
79
14 University of Virginia (Darden) Charlottesville, VA
Score
79
17 Carnegie Mellon University (Tepper) Pittsburgh, PA
Score
77
18 University of Texas--Austin (McCombs) Austin, TX
Score
74
19 University of North Carolina--Chapel Hill (Kenan-Flagler) Chapel Hill, NC
Score
72
20 Indiana University--Bloomington (Kelley) Bloomington, IN
Score
71