<p>Is it safe to do so ???</p>
<p>I don't see a reason why it wouldn't be safe.</p>
<p>Haha, yes, you do. I just did it when I switched my November SAT II's to December.</p>
<p>It depends what you're changing...</p>
<p>If you're just changing from one subject test to another, you don't need to worry about any fees. If you need to add a test, I think the policy is for them to bill you later. If you're switching from SAT I to SAT II or vice versa, that's a different story.</p>
<p>Regardless, if you do need to read them your credit card number, it shoudn't be a big deal. The Collegeboard is a reputable organization.</p>