Spent weeks reading through Salesforce Manufacturing Cloud official documentation and their accredited professional guides before my first attempt. Thought I had everything covered but the exam questions were completely different from what I studied.
Got frustrated and switched to
itexamstopics.com exam topic-wise questions instead. Grabbed their web version which had all the practice tests I needed. They also provided demo questions upfront so I could see exactly what the real exam format looked like. Doing real practice tests instead of reading those docs made everything click way faster. Two weeks of grinding through their practice exams and I passed on the second try. If you're going for AP-213, forget the Salesforce docs and jump straight into practice questions. Their web version is solid with good demos to get you started.