BD+C AP exam

If you are taking the test before June 15, you'll be tested over LEED 2009. I would not spend time on the pilot credits for that. Know the requirements for each credit, know the thresholds where applicable, like 10% recycled content/20% recycled content. An excellent prep for the test is to read the first page of each credit in the BD+C reference guide - a good place to focus 80% of your study time. Beyond that, know definitions of terms (the glossary is a good place to start), Be familiar with MPRs, and download some sample LEEDONLINE templates. For materials credits, know which are counted by weight and which by cost. You've got 90% of your LEED AP test prep right there. If you are waiting until after June 30, you'll be tested over LEED V4. The test will be tougher. I would not recommend taking this test without the LEED V4 handbook which is changed a lot. New terms and definitions. If you can find yourself a test prep class hosted by your USGBC chapter, go for it. Check the USGBC Colorado chapter for their excellent study guide. Beware the independant third party "study guides" online - I've been scammed by them.

Depends on what other study materials you have. In the absence of other study materials I would be reluctant to go without the Reference Guide.