self- study US history?

<p>hey everybody. first post in this section. i would really like to take the SAT subject test for US history, but i'm not going to be taking APUSH next year, and i'll be taking world history. </p>

<p>how hard is it to self-study for the history subject test?</p>

<p>also, on that note, does anybody have some helpful materials/books that would be useful?</p>