I took LEED Green Associate and LEED AP BD+C tests both at the same time. Worst idea ever, at one instance I was about to take my things and leave crying (my native language is spanish, thus, for us is much more stressing). The goog part of this story is that I passed both tests with 95%. I took the tests on 2012 and eventhough I had the Study guide for LEED Green Assoc. the best for me and some coleagues who join me on giving the tests was to use the Reference Guide as study material. I was able to compare both and by far my advice is to have the reference guide and study using it even if you don't want to be AP with specialty.
Complementing this, I explored GBCI, USGBC and Leedonline web sites which have all the material you need regarding CIR, LEED Interpretations, Fees, MPRs, etc. and the good thing about this is that you get familiarized with web sites related to LEED.