I think it was really a combination of the Engine Performance and Electrical tests. Five gas analyzer stuff too.
The composite vehicle has a ton of data and a lot of it isn't used. I think I'd just get familiar with a few of the types of the systems it uses and where to find that info. You spend a lot of time searching for the data but there is too much to try to memorize, so just know where it is. I'm pretty sure the diagrams were most of what was used in that info, if I remember correctly. Some system descriptions too. I feel like I recall some questions on APP sensor failsafe modes that you'd find in the system descriptions.
It might be worth getting the motor age study guide for it. I like those.
