<p>Anyone with experience in taking more SAT IIs than one originally signed up for on a testing date care to tell me how it works?</p>
<p>simple. you just stay when the proctor says ‘anyone who is only taking one SAT subject test may now leave’ and you take your next take in the same fashion (1 hour, fill in test code, etc…). sometimes you will be charged extra, but sometimes not.</p>
<p>How would the College Board bill you?</p>
<p>I believe (I might be wrong) that they won’t release your scores until you pay for the test(s). Pay online using credit card.</p>
<p>I see, but it’s definitely permitted to add more Subject Tests than one originally signed up for on the testing date right?</p>
<p>Of course, take as many as you want (up to 3).</p>