I have my MET exam on Sunday. I have the Jeremy Pratt books and find them great. I must admit, bits of MET can be very daunting. Perhaps reading over the section twice will help. It wont take that long, there is only 150 pages or so and you could do it reasonably in a week.
The PPL Confuser is a MUST, but only use this once you have read the theory sections and have a decent understanding otherwise, like said above, you will only be learning the answers to the questions and not the knowledge behind it.
Best of luck and let us know how you get on.
Maz