US History SAT II Help!!!

<p>I'm planning on taking the US History SAT in 2 weeks and I have yet to start studying. I took USH course last year but I forgot a lot of the stuff, any recommendations of which book I should use? I'm only aiming for a score of high 600s, nothing more so..</p>

<p>Also, which time period should I focus on more than others? Like should I even spend time looking at Bush Sr.'s presidency and beyond?</p>

<p>I’m using my old AP books from last year. It should cover more than what will be on the test.</p>