I just sat and passed SABE401 today, and can only strongly recommend learning as much of the manual as you can.
Like you, I took as much advice as I could from various people ... among them, other folks who had passed, and I can honestly say that I didn't get the same questions as they did.
e.g. everyone I have spoken to said that they did not have a single question about sizing and thresholds. I had questions on both.
I strongly believe that the only way to pass a BOE exam is to study the contents of the manual again and again ... and again. That way, even if you don't know the answer for certain, you'll be prepared to make an educated guess.
Anyway - best of luck with the exam. I hope you do well.