Simply, you need the API 1104 code book.
There's only 60-some odd pages, so reading it is not too challenging, and it only takes a few times to get you familiar with it. Do not try to memorize it, but memorize how to navigate it. There are some study guids that are handed out during the seminar, but not sure if you are taking that. If not, look on the CWI application and somewhere it tells you "recommended study material" - look on there.