As far as the law course is concerned, I'm currently an UOL (External System programme) student, the passing rate here is also the same, for the 1st year, it's roughly 30+ % and the figures will gradually increase. Law isn't that easy to study. U need analytical skills and good linguistic approach. Although it's pretty easy to enter, but it doesn't assure you will pass.
The law programme offered by UoA is 4 years, compare to other respective Unis in UK, only 3 years. Law isn't just about memorising, bear in mind, it's not also regurgitate what you have studied. It's more than that. It's like studying philosophy (in laymen's term, it's called bullshit). Nevertheless, if you really want to take up law, take A-level's law. Prepare and suit yourself 1st.