<p>I have paid for only one bu take three tests on sat. Is it possible and how should i pay for it?</p>
<p>It should say:</p>
<ol>
<li>I paid for one test on saturday</li>
<li>I wish to take three</li>
<li>Is it possible?</li>
<li>How?</li>
<li>Should I take it as a stand-by?</li>
<li>How should I pay for it and when?</li>
</ol>
<p>Alright, if you paid for one SAT II test, then you could just take 3 if you want. The proctor doesn't even know what tests you are taking. Just stay and take the next two, because all the tests are in one book. It's perfectly possible (I did it, especially when I wasn't sure if I wanted to add something). You do not have to take it as a stand-by. Collegeboard sends you the bill afterwards for the extra 2 tests you take.</p>