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<p>Just to set the record straight. You don’t need to take SAT subject tests if you submit ACT scores.</p>
<p>See [Penn</a> Admissions: Required Tests](<a href=“http://www.admissionsug.upenn.edu/applying/testing.php]Penn”>http://www.admissionsug.upenn.edu/applying/testing.php) “The American College Test with Writing, may be used in lieu of the SAT Reasoning Test and two SAT Subject Tests. No preference is given to either test.”</p>
<p>In practice, however, this is probably a moot point for most students, as they will be taking SAT subject tests for other schools which require them in any case, and Penn requires you to submit all test scores from all tests taken.</p>