I just used the Pooley's PPL manuals as well as the confuser and found both to be useful. I read through the confuser to start and hammered away at the questions. I took note of what areas I struggled with and studied those in detail using the Pooley's PPL manuals. Navigation was the only subject the manuals weren't much help to me, but I was briefed by my instructor on how it's done in any case. I'm sure your instructor will do the same. But not to worry, the PPL exams aren't difficult by any means. Treat them as a learning exercise.
Best of luck!