One way to keep yourself accountable would be to get an SAT US History test prep book in the beginning of the year, and use it for review as you go along through the course. This way you can reinforce the information and ensure that you can recall or apply it when answering Subject Test practice questions.
The SAT US History covers a huge time period. It requires knowledge that spans several hundred years, and this knowledge takes time to learn, an entire year or more of studying US history in class.
Barron’s SAT US History book is much detailed and comprehensive compared to AMSCO, but that level of review might not be required to SAT U.S. History test prep.