Can you take the SAT IIs as standby ?

<p>I am not quite sure about how well I did yesterday. In case the results are bad, I may want to take some of these tests again in Nov. But I don't want to waste a lot of money registering and then to find out later that I did relatively well. I am just wondering if I should go ahead and register before the late registration deadline or wait till I get my scores.</p>