<p>I decided to sign up for the American History SAT II in June. I also was planning on taking a math SAT II in june as well, but I never signed up for it because I was trying to decide which one to take. My question is, can I go there test day and decide to take the math in addition to US even if I didn't sign up for it, and pay for it then?</p>
<p>Yes you can. They'll bill you later. Just tell the proctor so you make sure to jump through any hoops they require...</p>
<p>thanks for the response</p>