<p>Does Princeton’s requirement of any three subject tests in three different subjects mean three different subject tests or three different subject categories? For example, would it be acceptable if one submitted U.S. History, Math 1, Math 2?</p>
<p>Yes, but there are “strong recommendations” for engineering students. Some would argue that it looks better to have different disciplines on your profile, as it shows a more diverse body of knowledge.</p>
<p>Engineering students should have at least one math and either Physics or Chemistry.</p>