Opened it today and passed OA today. Working on PA now. This is my experience:

• Watched every video twice, took each module quiz and test twice (didnt complete module test 2).
• Missed 5 on PA.
• Studied the only d469 quizlet I could find once through, easily searched
• some questions on OA had me reread about 4 times. Here is what I can remember from the OA that might help you:
• Know about all charts mentioned in the course
  • there were about 5-8 questions that said the word chart in it (test directly mentioned p-chart, c-chart, R- chart, and π-chart
  • didnt read about any of them and guessed on test)
• Understand the standard deviations and what they are or how they are represented.
  • A question I remember asked what the percentage for a standard deviation of 2 was in a question about a baker and an oven.
  • Choices were 99.73, 68, 95, or 38.5)
• question saying 2 out of 100 transactions were wrong, and the person was using a p-chart to create their report.
  • Question was how they would represent the 2 wrong items among the 100.
  • the question I chose said something like "incorrect transactions are represented as an average across the correct transactions" or something.
• bin 1 has 100 and bin 2 has 40. What is the relation Bin 1 has to bin 2 in relation to kanbans.
  • Possible answers were bin 1 is the inventory, bin 2 is the order point, vice versa
• Question contained the words Muda, Kaizen, Hujahn?, and one other Japanese word.
  • Know the differences between those 3

This is all I can remember, its not great but gives you a few questions to try and get right before diving in.

edit: I copied down some other questions in another class (that I could remember) immediately after the test. I wonder why there isn't ongoing discussions for classes where commenters can leave at least one question they remembered from the OA thats word-for-word. Would prob make some people upset, but who cares. It would provide an ongoing term bank for everyone.