Just read the grade boundaries for Edexcel maths, June 2014 exams:
Maths A Higher
Grade C: 28.5%
Grade B: 47.5%
Grade A: 66.5%
Grade A*: 82%
Maths B Higher
Grade C: 42.5%
Grade B: 60.5%
Grade A: 79%
Grade A*: 89%
Bearing in mind that 90% of schools ditched Maths B once the modular aspect was dropped by the government, the disparity in grade boundaries for Maths B Higher level are ludicrous. They are roughly a grade apart from Maths A.
Maths A Foundation
Grade C: 70.5%
Maths B Foundation
Grade C: 86%
Similar problem with Foundation level. While the grades tend to suggest that Maths B must be easier than Maths A hence the higher pass marks, this just isn’t true.
For the future, there is no justification for *any* school putting students through Maths B. Ditch it (which is what should have happened when the modular aspect was discontinued).