Any advice for someone starting the CWI seminar this weekend?

[TubularFab]

As the title says, I'm starting the AWS CWI seminar this weekend with the exam the following Saturday. I'm starting to get a little nervous about it all, but I get the impression that the seminars are really, really helpful. Some have told me the failure rate on the test is extremely high - like 70 - 80%; is that true? Besides focusing on the tabbing of the D1.1 manual does anyone have any other advice going in?

Thanks!