Subject Test Questions - All Help Appreciated

<p>Hi everyone, I have been lurking these boards for quite some time now, but I finally decided to register today as a member. I have a few questions regarding the SAT II Subject Tests, so hopefully some of you can provide me some answers. I apologize if my questions are too redundant. I provided general info so that you can help better assess my questions. Please read my thread before asking me questions.</p>

<p>General Info:[ul]
[<em>]I am a junior.
[</em>]I have registered to take the Chemistry, Literature, and US History SAT II Subject Tests on May 3.
[<em>]I completed a World History and a Biology class Sophomore year.
[</em>]I am in a general Chemistry class but I plan to take the AP Chemistry exam.
[<em>]I am generally not that good in math, something that is partially my fault and partially my math teachers' fault.
[/ul]
Questions:[ul]
[</em>]I registered for the SAT II Subject Test already, but I remember seeing on the Collegeboard Website that on test day we can switch the tests we want to take. Is this true, and if so, are there any limitations to it?
[<em>]Will my AP US History class as well as a thorough perusal through the AP US History prep book by REA be sufficient for the SAT II US History test?
[</em>]Will the Barron's AP Chemistry prep book be sufficient for the SAT II Chemistry Test? If not, what book would you recommend?
[<em>]Since I am not too strong in literature analysis (as I did horrible on the SAT CR), should I even bother taking the SAT II Literature? Would studying for the SAT II Literature help me for studying for the SAT CR?
[</em>]Because I am not too strong in literature analysis, if I do not take the test, what other Subject Tests should I take considering that I only have a month to prepare? I was thinking either Biology E/M or World History but it has been a year since I have seen the material for either.
[/ul]</p>

<ol>
<li><p>You can switch tests, any one you want, except the languages. You can't change languages.</p></li>
<li><p>Yes, your AP US History class and the REA book should be suffient. It's what I'm using</p></li>
<li><p>For the Chemistry, I have heard that Barron's is usually harder than the actual test. I can't give you much information on this subject because I haven't taken the test.</p></li>
<li><p>I suggest that you take the Literature one during the September or October 2008 test date. Why? As a junior, I don't think you are fully prepared. I'm a junior and I'm not. </p></li>
</ol>