from what i have found in physics aqa, is that the isa boundaries are pathetically high. I mean 43/50 for an A, 40/50 for a B. What is going on there? Yes the paper is not the worst thing in the world, but one mistake and you get at best a C.....
The EMPA on the other hand is ridiculously hard and this is shown by the boundaries. For June 10: A*= 39/55, A=36/55, B= 33/55