<p>I applied for two SAT IIs for December (Math IIC, Lit), and I know i can change one of them to another subject, but is it possible to add another subject, so I'm taking three?</p>
<p>Yeah, you can take three even though you signed up for two. The College Board will send you a bill.</p>
<p>or if you registered with a credit card, the cost will automatically be billed to the credit card with which you registered.</p>