The CSWP test largely concentrates on core skills (e.g. how to set up a model for symmetry, interpreting and applying design intent, etc.) which are quite relevant no matter what the current release might be. People taking the test must also complete a modeling challenge (choose one from: sheet metal, free-form shapes, and top-down assembly modeling) as well as a written test (which is pretty common sense in my opinion though there are some tricky questions).
From where I stand, I believe the skills required to pass the test only become less relevant if you stop using the software. Don't get me wrong, it's important to be up to date on what's happening with SolidWorks in the here and now as well but that is not the focus of the CSWP.
I highly recommend the preparation course offered online by i.get.it as it covers the EXACT scenarios that are presented in the test. Their Skills Gap Assessment test is also a very good prep for the written part of the CSWP.
Chris Gervais
Application Engineer
CSWP, CSWST