Whats really helped me is something i read in Derren Brown's book tricks of the mind, it has a large section on memory, and seen as though he studied law at uni he gives examples of how he remembered certain cases. For example.
Pharmaceutical Society of Great Britain v Boots Cash Chemists Ltd [1953]
This technique works best if you have a vivid imagination. I imagine a man in a full suit, chest out, with a clear sense of authority trying to buy some socks. (authority helps me remember its a governing body, socks = society so i dont mistake it with anything like organisation.) The man hands the woman in boots a crisp £50 note, The woman, dressed in boots work attire is shaking her head and holding up 3 fingers, she wants £3 more. The man stomps away. (50+3=53 for 1953. the woman dressed in attire makes me remember boots, The fact the man walks away unable to complete the sale tells me the legal principle, displays are ITT and not a contract available for agreement.)
Its important to visualise these are vividly as you can, take in as many senses as you can, sight, smell, touch. When you create more scenarios for different cases the best way i found to remember them is with a 'memory palace.' Use a familiar place with a large number of rooms, then like your images created for cases to each of the rooms. For example, for contract law my setting is my local shopping centre, i visualise myself walking into boots and seeing the event unfold before my eyes.
Now i know lots of people dont beleive in these little tricks, neither did i before i started studying law, i figured it was just more stuff to remember, but i have actually really benefited from them.
Oh and an hour a day, everyday, is worth far more than 3 hours a day every once in a while