<p>Would it be cheaper to call by phone and add an extra subject test or just wait until test day and inform the test proctor? Would I need cash or credit card if I am adding it on test day?</p>
<p>Would it be cheaper to call by phone and add an extra subject test or just wait until test day and inform the test proctor? Would I need cash or credit card if I am adding it on test day?</p>