<p>So here's the thing: I've already applied for the January 23rd SAT Subject test (Chemistry). I now want to do the Physics SAT II.</p>
<p>I tried changing my SAT application through the "Change my test center" option, but everytime I try to add in Physics by clicking on the check box I get a prompt telling me that "You can choose additional SAT II subjects on test day" or something.</p>
<p>So what does that mean? Even though I only registered for Chemistry, I can also take the Physics by just doing it on the day of the exam?</p>
<p>Do I bring actual money with me to hand over to the supervisors...? How does it work? Note that I'm not living in the United States, but in Dubai (UAE)</p>
<p>A quick reply would be nice!</p>