Good news: today I passed the LEED for Existing Buildings exam with a score of 190 out of 200. So I'm a LEED Accredited Professional.The exam was tough, but it's a good one. It does a good job of covering useful information and strategies regarding outdoor sustainability (landscaping, heat islands, etc), water efficiency, energy efficiency, reduction/reuse/recycling, and indoor environmental quality. In fact, even if you're not taking the exam the Reference Guide is a really useful resource if you're interested in sustainability.
Obviously the test also has questions that focus on the bureaucratic processes related to dealing with the USGBC during LEED certification, which are less interesting, but useful if you want to get into the green building field as a consultant/designer/architect etc.
