绝大部分州大不要求SAT SUB， 好的私校一般都要，去各校招生网站看。

例如：https://admissions.yale.edu/standardized-testing

SAT Subject Tests are recommended but not required. Scores from SAT Subject Tests (like AP exams, IB exams, and AICE exams, see below) can help an applicant demonstrate specific areas of academic strength. Applicants who do not take SAT Subject Tests will not be disadvantaged in the application process. Yale does participate in Score Choice for the reporting of SAT Subject Tests. Applicants may choose which, if any, SAT Subject Test scores to send to Yale, whether or not the applicant sends SAT or ACT scores.

如果是HIGHLY RECOMMENDED， 那对小中来说，差不多就是必须了。