<p>I am signed up to take the SAT I on Dec. 4th, but I want to switch it to SAT II Chemistry. What do I do? I know I'm supposed to switch at the test center, but how does the whole standby thing work? Is there a pretty good chance I'll get to take the test?</p>
<p>Most likely you'll be able to take the test, but its not for sure. You just have to see if they have any extra materials and seats for you.</p>