For those who passed their plumbing / pipefitter exam — what study materials actually helped you?

We've been putting together exam prep resources for trades licensing and curious what the community found most useful when studying.

So far we've focused on:

1. Formula reference sheets

2. Flashcards for key terms and concepts

3. Timed mock tests that feel like the real exam

4. Quick review sheets for last-minute prep

5. Worked example problems with step-by-step solutions

Does this match what people actually needed? Anything missing that would have helped you pass?

Would love genuine feedback from people who've been through it?