你难他也难，不必着急，关键是进入哪个分数段。前%多少。.

下段文字表明，应该是5年，所以只要在高中期间考的，成绩都有效。在美国从K9-12都有效。对于中国大陆考生，是否符合下面的说明，需要再落实一下。
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The scores that an individual receives for the SAT are considered valid beginning on the Thursday following the exam, and the scores will remain valid indefinitely. However, the Educational Testing Service (ETS) will include a notice that explains that the scores may no longer be an accurate representation of the individual's abilities with any score report that is issued more than five years after the date that the individual took the exam. Moreover, some undergraduate programs that require SAT scores will not accept scores that are more than five years old. As a result, it may be wise for individuals who are not planning on attending college in the near future to wait until they apply to a college rather than take the exam now..