shows that the highest accuracies are achieved
in the 2-classes case. However, this is largely a product of the
small percentage of students who fall into the Fail class
compared to the Pass class. Careful inspection of the
distributions in the confusion matrices reveals that the highest
accuracies are always achieved for the largest classes, which is
the Good students in CTU (undergraduate) and the Very Good
students at the AIT (postgraduate)