No, you won't see that exam again, they will give you your scores but you won't even know which questions you missed. There is a cut off score for a CWI, and then if you don't make that cut, there is a cut off for a CAWI, but if you missed that cut as well you get to test again.
A CAWI has to work under the supervision of a CWI, I think is how it works. I have a CAWI that works for me and helps me with the inspection at another plant.
As far as studying, I would be familiar with the code book and how it is laid out. I think they(AWS) suggest tabbing the first page in each section so it will be easier to locate your answers on the open book portion. Time will be your enemy, so move quickly through all the questions you are sure about and come back to the ones that you left and think on them some more.
Good luck,
John Wright