College applications: Where does "recommended" end and "required" begin?

<p>dollyflower, Princeton does more than “recommend” the specific SAT IIs. From the Princeton website:

[url=<a href=“http://www.princeton.edu/admission/applyingforadmission/standardized_testing/]Princeton”>http://www.princeton.edu/admission/applyingforadmission/standardized_testing/]Princeton</a> University | Standardized Testing<a href=“emphasis%20added”>/url</a></p>

<p>“Should” is stronger than “recommended”. It means “Do it.”</p>