<p>If I take two tests tomorrow and do badly on one of them, I can't cancel just one, right? I have to cancel both, if any?</p>
<p>you have to cancel both</p>
<p>yeah, maybe you should think carefully before starting the 2nd test, especially if you felt you did really well on the 1st one.</p>
<p>well, if you're really sure about one test and not the other...</p>
<p>you can walk in and take one test.
then, leave the second COMPLETELY blank.
the only thing is that the money you paid for the blank test won't be given back, but that's better than cancelling a potentially-high score.</p>
<p>Taken from Collegeboard.com FAQ:
I signed up for three Subject Tests, but I only want to take two. What should I do?</p>
<p>On test day, simply take the test(s) you want to take. There's no need to contact us</p>