With the PMI-ACP® Agile certification exam, you see a lot of products that are factual but not relevant. That is, some training materials out there are based on the reading materials identified by the Project Management Institute and not on the actual exam.  As part of your learning strategy, get your training materials from someone who was a content reviewer of both the the initial exam content but also the upcoming exam revision.
Get 100 flashcard questions/answers in an easy to download PDF file.
Get a 25 multiple choice practice test in an easy to download PDF file.