Figured I'd just update this thread instead of creating a new one.
I sat for BEC yesterday (2/26), and my biggest piece of advice pretty much parrots what has been written here…COSO + IT. Think of the way people stress Govt/NFP for FAR, but even moreso. I was ready for a bunch of COSO/IT, and still was amazed at the amount of Qs regarding them.
Regarding SIMs, only because of time I felt constrained and had to make some guesses. Also wasted 5 – 6 min on one because I was a moron and had tunnel vision, was overlooking a simple item which obviously kept me from getting the correct answer to a problem I knew was easy points and didn't stop until I got it (eventually but what a time waster).
Once I was done with MCQs, I had 2:20 on the clock. I was shooting for 2:30, but my hand scrubbed some of the marker of my scrap work and I had to rewrite/redo a couple of MCQs. I learned from my previous experiences not to dwell to much on any MCQ with the clock ticking away. I didn't practice any written communications so I wanted to leave an hour for them but ended up leaving 45 minutes. Definitely rushed through a document heavy SIM with tons of information. The scrolling is such a pain. These SIMs weren't on par with FAR but for me were definitely much more difficult (especially with the amount of information and documents) than Audit. Also, you do have access to AL, but like ReckedRacing mentioned, don't really see how much it would help.
Written Communication I thought I would have a brain freeze but my hands just kept typing, I was throwing in “buzz words”, and the auto-correct feature is pretty handy.
Main takeaway, study everything, but know and love COSO. IT also, but I do think it's a hit or miss. I had Roger plus NINJA/Gleim test banks. For the last couple days of review I hammered NINJA IT because it seemed to be the most comprehensive and Gleim COSO.