Emergency: Help me choose!

<p>I don't know which SAT IIs to take in October. I'm taking 3 and I HAVE to make great scores my first time around because I'll only have a chance to take them once.</p>

<p>I'm taking Math IIC for sure. </p>

<p>Otherwise I'm considering Bio, US History, Literature, or Spanish. I make good grades in all of the classes but I never took APUSH (because I was in IB). I got a 5 on AP English Lang and a 4 on AP Spanish...but I don't know. How hard are each of these tests? What are the best prep books for each? </p>

<p>Any advice on ANY of the tests would be appreciated. Thanks!</p>