From start to finish I prepped for 4 months. I studied 3 to 4 times a week a week and there were weeks where I didn't study. Here are my primary steps.
1. I used PMI-ACP PrepCast and the PMI-ACP Prep book by Mike Griffiths.
2. I watched most videos twice, some of them more than that.
3. After I watched a video, I reviewed the same section in ACP prep book
4. I'd take 2 or 3 30-question quizzes on the subject.
In the end I took two 120-question full test. I took countless 30 to 60-question quizzes.
For me, understanding what delivers value and how value is delivered is they.