Was looking through the paperwork for my assessment the other day as it's in the front of the folder with all my CMS stuff in it. There appears to be an actual pass mark stated in there (ie - an acceptable level for each of cells/errors/omissions) with a box to tick for either pass or fail. I was surprised to see it as I though it was supposed to be a closely guarded secret, yet anyone looking through them would be able to find out - though I guess knowing afterwards probably isn't much use!
Also i've no idea if it's TOC specific and/or changes each year.