<p>Sorry. I need to know just in case</p>
<p>Yes. You can take up to 3 subject tests on the same day.</p>
<p>On top of that, you can register for one, and take two/three; or vice versa. The only exception is with listening tests.</p>
<p>They will bill you if you take extra. They don't refund though (unless you pester them a lot, and even then you just get it discounted from future exams).</p>
<p>Yep, and you can change which ones you want to take when you walk into the test center. So if you register for U.S. history but want to take bio instead, you can do that.</p>
<p>^ Really? Wouldn't that mean they would have either a surplus/lack of test booklets for each subject?</p>
<p>No, all the subject tests are in the same <em>big</em> test booklet, so you can take them in any order you want.</p>