I wasn't really meaning the school predictions but rather the UMS marks.
With DD1 she knew by the time she filled in her UCAS form that she had to get VERY low marks in the remaining modules to get As and everyone else also knew roughly what they would get unless they did no work at all or suddenly turned into a genius!
Agreed the module system leaves far fewer surprises that the end of the year - in ye olden days we hadn't really got a clue what we would get - only people we could compare with were those in our class... I had a relative doing the same A levels - apparently he was top of the class and doing fantastically well ... trouble was the schools were not comparable and I beat him by several grades.
I read student room and find that many of the kids don't seem to grasp the module / UMS system at all - there are many statements of "I got CCDD at AS level, am aiming to get A* at A2" - trouble is you just can't with UMS like that!