Um, they don't just compare raw marks between different subjects, they don't go "Oh look, 50 people got 95+ in maths but no one got 95+ in legal so therefore we have to make the assumption that legal was that much harder than maths and must therefore be scaled right up." They take into account how the candidature of each subject performed in all of their other exams compared to the rest of the state, not just adjust each exam's marks to match every other exam.
Legal studies is generally a poorly scaled subject, so unless we all did really well in every other of our exams and really badly in legal, the BOS is not going to adjusting the marks very much at all.