US History SAT subject test? Please help.

<p>which books should i study for US History SAT subject test?i want
to get into Ivy league college.I am also taking math2,chem and bio. Is US history easy? And what
score did you got?
i heard that AMSCO and Direct
Hits US History are good to
prepare well for subject test.
Should I buy both? Should i
consider any other book?i wanna score a perfect 800. So
please help!</p>