When you sign up, they send you a CD with the revision material on it - studying just that will get you a pass if you really get it into your head properly, but if you want to do "well" then you need to be ontop of the trade journals as well as getting your hooks into one or two of the well know comprehensive brewing texts (Kunze, Briggs, Quain etc) to supplement the revision material & give you a different perspective from the IBD's sometimes narrow focus on the english tradition in the mateerial they supply.
A bit of searching about on torrent sites etc will net you electronic copies of some otherwise very expensive brewing text books. Under no circumstances download them and save yourself hundreds of dollars.... that would be naughty.
TB