This book will give you a good general guide to land law and includes reference to the key cases in this area, but it's not a good idea to use its suggested answers as your own, as they of course reflect the writer's style.
It's useful to flick through for revision and to make notes on in case there are key theories or cases you've missed or don't understand, as it explains them reasonably clearly and succinctly, but it doesn't cover things at a deep enough level for you to rely on it alone when considering how to structure your answers in a land law exam.