<p>Let's say once I sign up for taking 2 subject tests in May could I add additional one after I sign up for two? Is there a late fee?</p>
<p>Also would I have to tell them which test in specific I'm going to take? Or just the number??</p>
<p>I'm pretty sure there is a way to add on an additional test on the actual test day (well, I remember some people needing to talk to the proctor about adding tests and him saying it wasn't a big deal...)</p>
<p>When you sign up, you'll need to indicate which subjects you want to take. That said, you can change the subjects on the actual day of the test without needing to notify CB and without any sort of penalties.</p>
<p>Really? So let's say I sign up for chem and math II, on may 3rd i can switch one of them over to US history??</p>
<p>Yes, that's fine. You'll be given a booklet with all of the subject test questions in it; you'll just open the booklet to the subject you want, and bubble in the subject code on your answer sheet.</p>