<p>USC states that they prefer you just submit all scores, so I would take them at their word and not worry about score choice. (the kids always disagree with me on this, so I expect that other opinions will soon appear 
).</p>
<p>Subject tests are not required, but they are recommended. If you feel you may do well, go ahead and take a couple of subject tests. [Freshman</a> Standards - USC Undergraduate Admission](<a href=“http://www.usc.edu/admission/undergraduate/apply/fresh_standards.html]Freshman”>http://www.usc.edu/admission/undergraduate/apply/fresh_standards.html)</p>