Failed my journeyman plumbing exam twice — what am I missing?

So I'm officially on my third attempt coming up in six weeks and I'm honestly starting to question everything. First time I failed by 4 points, second time by 2. I feel like I keep getting tripped up on the pipe systems and materials section — like I know the basics but the questions always seem to find some edge case I haven't studied. I've been using a random mix of YouTube videos and old textbooks my uncle gave me, but I don't think that's cutting it anymore.

A buddy from my apprenticeship suggested I switch to more structured Plumbing practice test resources instead of just reading. I found the Plumbing Pipe Systems & Materials practice tests this week and they actually feel closer to real exam questions than anything else I've tried. The explanations when you get something wrong are genuinely helpful.

For anyone who's passed — how many hours a week were you studying in the final month? And is there a particular study guide format that clicked for you? I need a real plan this time, not just hoping something sticks.