I always like to use the minimal amount of resources possible to prepare for an exam. According to one member both Civil War and USSR can be aced with as little as IC and $5 sparknotes. I'm a believer that if one person can do it anybody can. Check it out from redleg143:

Just recieved my test results for Civil War and Reconstruction and Rise and Fall of the Soviet Union:

Civil War= 70

Soviet Union= 58

Both passing scores thanks to Instacert. I used Instacert almost exclusively for the Soviet Union test with the exception of a thin Sparknotes guide that only covered the Russion Revolution. For the Civil War I used two Sparknotes guides and Instacert. Instacert is the BOMB!