"Yale does participate in Score Choice for the reporting of -

SAT Subject Tests." 

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

"

Recommended 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."