10段大学最多只要求2门：
比如哈佛，We require the SAT Reasoning Test or ACT Test with Writing, as well as two SAT Subject Tests.
这里说的是两门。问题是你的“最多”是哪里得来的？
仔细读下去，哈佛说：Applicants may wish to convey the breadth of their academic interests by taking tests in different subjects. All students are encouraged to submit additional Subject Tests (which may include one in a student’s first language), Advanced Placement or International Baccalaureate test results, or any other evidence of the breadth and depth of their academic accomplishments.
你的第二个错是说挑最高两门。不行。一般要求这两门是：
一文（文、史、外），一理（数、理、化、生）；尤其不能两门都是数学。也不能用母语（如不是英语）。都是理，那是可以的。
还有个常见误解，认为哈佛不能考（不能报送）SAT母语。
不是的，上面说了，如果在两门以外，那是鼓励的。
