I am new to IC. My previous tests in the order taken are: English Comp. w/ Essay-51, Principles of Management-59, Intro to Sociology-62, US History 1-66, Intro to Psychology-68, Biology-55, A&I Literature-62, Tech. Writing (DSST)-63.
*Taking Educational Psychology tomorrow*

As for the US History 1, I used only the REA book and passed. There is a lot of material on the test since it covers about 300 years, but I would say that most of the material was between 1775 and 1850.