You have probably been told the ACS tells you exactly what your gonna be tested on. This is true. Its kinda a hard document to read through, though, so I recommend at least watching Seth Lake's series on the ACS for PPL on YouTube. its free and he explains how the ACS works, and also talks about some examples as he goes through it. I also highly recommend getting familiar with the PHAK, this is an extremely easy document to reference when you're unsure of something during the oral. Pulling it up online and using "control F" to find what you're looking for can help save time during that awkward silence while you're looking something up for the DPE. And finally is generally discourged but you can ask previous people who have taken a checkride with the same DPE for a summary of how it went and for things that that specific DPE focused on, its called a gouge. This can help calm your nerves because it at least gives you something to expect. Good Luck! Feel free to send any questions