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I think one person might have mentioned it but in case they didn't, I'll take stab at it...
The most important aspect that you need to remember especially if you already inspect welds, is the FACT that you will be inspecting the samples to a "code" that is NOT one that is actually used in real practice!!! In other words, it is NOT a REAL CODE!!! Once you focus on that, and work the book of specifications that is in front of you, and not to whatever code or standard that's still in the back of your head which more than likely be the last one you were working to, then you will do well...
Along with all of the other suggestions given to you by the other contributors in this thread, remember to relax and take your time because if you are as experienced as you say, you will have more than enough time to complete Part B. In fact, you should have started familiarizing yourself with the most current version of the book of specifications used in Part B for some time now and if you haven't done so, then go over to the certification section of the AWS website or better yet, here's the link to the .pdf file:
http://files.aws.org/certification/CWI/Book_of_Specs.pdfDownload it and study it well... All of the rest will fall into place provided that you focus on the Book of specifications in front of you... Finally, the reason why so many of those folks you mentioned failed part B is really because they were not focused on working the samples according to the Book of specifications they were supposed to be working to and instead, were thinking along the lines of the last real code that they were previously working to which would be obvious if one was to more closely examine the answers based on how they came to certain conclusions on how they interpreted the acceptance criteria from what was actually rquired of them from the book of specification they were supposed to be working from!!! Basically, a very simple error in judgment that cost them that part of the exam - PLAIN and SIMPLE!!!
Respectfully,
Henry