the aim isn't to memorise the questions, it is to identify what areas you are knowledge deficient is. I'll admit it takes a certain amount of emotional maturity, to be honest with yourself about your knowledge, but then again so does flying a plane.
Studying for PPL exams is no different to studying for any set of exams. After reading the books (you have to start somewhere) and making your own notes it is IMO imperative to practice answering questions.
But I echo the above. The trick isn't to memorise the answers, it is to make sure you know how you arrived at the answers, and if you can't work it out go back to your notes. If that doesn't help go back to your books. And if that doesn't help, ask someone.