I can only speak for sociology and psychology here: both subjects have a very heavy work load as they both individually consist of memorising lots of theories, hundreds of names, studies and numbers. I remember in preparation of my synoptic psychology exam, I needed to know nearly 100 names/studies and on average, 2-4 numbers (in the form of statistics such as percentages) per study. Psychology took up 70% of my total revision time. I would only take them if you were dedicated to learning these subjects, as yes, they would be very suitable for a law course.