Lighten up! There are not that many CWI's here in the forums, so give it some time.
I took the test 30 years ago, and I know it has changed somewhat. I used to teach preparation courses for the CWI exam as well.
My advice would be to concentrate heavily on prequalified joint weld procedures...knowing what applies, the limitations, and why. I would then work on consumables and processes...know them backward and forward, including the limitations of each. Pick up on little things, like when another code needs to be interjected (i.e., all of the welders on a project are qualified for welding to D1.1, and are doing fine with the structure, then they start to put steel decking on. What qualifications do they need now?)
Know the qualification process for welders and what positions apply and why. Seems basic, but can be tricky if you are doing T-K-Y connections or other "different" structures.
Know about inspections and the limitations of visual inspection and when to recommend nondestructive examination or testing.
Good luck.