I have taken the FE-Electrical exam on October 2012 and passed it on first try. Seriously, I was not prepared, and I had a mindset of winging the FE exam and will just take it again on April 2013 as it would help me to study on what would be the topics to study for the next FE exam. I didn't study much of Electrical topics in depth prior to the exam. I just looked on my class notes. With that mindset, I thought the AM session killed me. When I opened the booklet, I felt like I was having a panic attack because I could not stop skipping most of the questions, then I calmed down as soon as I saw some questions that I could answer easily. I was 80% confident on my answers to 70 questions (I think), then guessed on the rest. The PM session (Electrical Discipline) was a little bit straightforward (easier) than I expected. Because of my lack of preparation, I have to triple check all of my answers before answering the next one so that took a little time too. I believe that I only guessed on 5 questions for PM session.
In terms of studying, I would suggest to study the basic theory of all the topics covered on FE-Electrical exam. My specialization was in control theory, so that section was a breeze for me, but there was a question there that I have to guess because I forgot how to do it. At first, I thought the computer architecture questions were a little intimidating but when I read the questions and looked at the diagram carefully, I find it a bit easy to answer. My only background in computer arch is the digital logic that I took sophomore year and microprocessor in junior year and those should prepare you enough for the test. On DSP questions, study the basic mathematical theory for DSP and you should be fine. I thought, in general, the Electrical discipline is a little basic for me.