Here is a Test Review PowerPoint for the American Civil War. A separate item, the "Civil War Question Packet" accompanies it.
Here is how I have my kids prepare for tests:
Reserve a computer lab or laptop cart
Have them work on their own
They go through the Question Packet, reading the questions
The PowerPoint slides match up with the Question Packet
The kids then write out the answers
This makes them effectively study. A lot of kids don't know how to study, don't have time, don't have the place to study, or are easily distracted. This approach makes them concentrate on exactly what they need to know.
If they work hard on this, they can't help but be prepared!