improving from 680/740 to 800 (hist)

<p>i'm a singaporean student taking SAT IIs in both US history and World History in June. Currently, my practice test scores are:</p>

<p>US history: 1st practice 650, 2nd practice 680
World history: 1st practice 710, 2nd practice 740</p>

<p>Whats the quickest way to improve these scores to as close to 800 as possible?
(Chem, Math IIC both scored 800 in Dec '06)</p>

<p>Also, will uni officers be impressed with someone who has no background in US history, yet scores highly on it? I'm thinking of using the SAT IIs to somehow compensate for a dismal history grade (I messed up my history A level exam last year).</p>