Hi jlg. I took this test about 4 weeks ago. I used IC, U.S. History I (Cliffs Quick Review) and Wiki. Picked it up on Amazon for $9.95. It's an easy read, just a little over 150-160 pages. Studied (a lot) over a 3 day period and got a 71 on the test. Did the same the the next week with U.S. History II (Cliffs Quick Review). Same price, same study time. Got a 69.
Most of my studying focused on IC. The Cliff Notes backfilled some information. I used Wiki (
http://en.wikipedia.org/wiki/Main_Page) to look up people and events/battles that interested me. Hope this helps.
-Shaw