I doubt many, if any, schools give grade boundaries for subject, simply because it is not possible. It's really hard to judge, because that test may have been dead hard and across the country, 49-60 would be average, and so 49 would fair quite well. However, that's not the case. In our school, and probably most other schools, they just give a mark and percentage.
To compare to my class (also AQA), we had people achieving from 40/100 - 85/100 and that's all our teacher gave us. But the grade doesn't really matter right now, just focus on what you need to improve on and how to gain as many marks as possible, considering you are struggling with method marks, I'm guessing?