Yes I definitely agree. I was supposed to get an A/A* in physics, was getting that in all the mocks, but in the actual exams I got Cs so I got a B overall. Trying to find the reason led me to the grade boundaries - on unit 4 there were 5 marks between grades and on unit 5 there were only 4 - that's 5% of the paper. Get 56 you get an A, get 51 you get a C. Absolutely disgusting, in my opinion grades should be at least 10% apart, so in this case 8 marks apart. Clearly they made ridiculous papers, everyone did similarly well, so they had to try and put people who otherwise would do quite averagely down a grade or two.