<p>I am registered for Modern Hebrew on June and I want to add biology. I just called the college board and they said I could just add another subject test on test day and they will bill me later. Is that true? Don't I need to add that this test on the internet? Will they bill the same visa card with which I registered for Modern Hebrew?</p>
<p>Why are you asking here? You already called the company that administers the test and got the answer.</p>
<p>Regardless, yes it is true and yes they'll just bill the same card that you registered for Hebrew with.</p>
<p>The only tests you can't add on test day are language with listening... those you have to register for beforehand.</p>
<p>Yes, you can just add it in on the test day, and it'll all be fine.</p>