<p>can I later cancel one before the test date because I can't decide if I should take Physics or US History. I got both books today at B&N and I need to look through them. I also have to take Math II. So can I just cancel one later even after I have signed up for them?</p>
<p>yes, you can cancel (i.e. you just don't take that test(s) on testing day and leave early). </p>
<p>if you aren't sure how many tests you're eventually going to take, just sign up for one and pay for the rest after you take the test. i don't think collegeboard refunds the tests that you cancel.</p>