<p>If I signed up for Sat II: Physics, is there any way I can change the test to Chemistry?</p>
<p>Just go in on test day and take the Chem. </p>
<p>The test booklet of the Subject Tests contains all the tests; you can take any number or whichever ones you'd like (except for Listening?!) without notifying the Collegeboard. If you take extra, they will bill you later.</p>