<p>I plan to just submit the ACT, and on the commapp site it says that you need 2 subject tests if you send the SAT or ACT but on Penn's website they say the ACT can be used in lieu of the SAT I and two subject tests. Penn's website is the correct one right? haha</p>
<p>Yes, trust the website of the school to which you are applying. For Penn, ACT with writing = SAT 1 + 2 SAT 2.</p>