I have taken and proctored the the exam, so I would like to share what I know (very little) and what I have observed. The written portion of the test is the "hardest" part. It's not so much that the questions are overly difficult, it's more a case of users not taking enough time with this portion of the test. The way the testing interface works, it's very easy to blast through and finish the (multiple choice) written portion in less than an hour. DON'T. Take your time, review each question thoroughly, and most important, review the answers before deciding on which one to choose. Even if you don't know the answer, giving it enough thought will allow you to make a better educated guess.
The basic skills and even the advanced modeling aren't as difficult as the written portion. The most important thing is to follow the instructions as they appear in the handout. You might think you have a better way to model the examples given, and maybe you do, but the automatic grading software is looking for specific things and will deduct points if it finds otherwise. The handout will tell you what the grading software is looking for, exercise your model as it says and you can find errors before you submit the model. If the handout asks you to "repair" something, don't simply remodel the part. You'll get whacked for that too.
Pick an advanced topic that you are familiar with. If you design a lot of sheet metal parts, do the sheet metal portion. Likewise, the top down assembly or advanced modeling. If you start to struggle early, you might consider bailing and moving to a different topic - you have that option. Be careful, no matter how well you do on the written and the basic skills portion, if you don't finish the advanced topic you probably will not pass the test.
The grading software has been shown to be overwhelmingly more accurate than human grading, and provides results in a matter of minutes vs. days or weeks. You get to find out if you passed before you leave the building (in most cases).
Look over the certification documents on the SolidWorks website, and try out the samples before you go for your test.
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Suggestions, comments, and other notes are welcome.
Richard