I appreciate what you are wanting and, if I was still teaching in a school, I could have told you what the numerical boundaries were last year.
However, even if I were not retired, I could not tell you what they are going to be this year, because they change 9sometimes significantly) from year to year depending on how hard the exam turns out to have been - if it is an easy exam, the boundaries tend to be higher etc.
Rather than thinking
marks, perhaps you would be better to think
Levels.
Go to
this page, and look at some of the markschemes (e.g.
this one from Jan 2011 which goes with
this exam paper).
Look at the questions, and then look at what the markscheme requires a candidate to do to get the highest
level for each type of question.