Greg,
I found the Oxford CDs useful, if a bit dull. I made notes as I went through each lesson which became a revision check list I could go over again and again.
Try to get a copy of the 'PPL Confuser' - out of print I think but ebay may help.
The 'exam secrets' guides are useful too, but don't include met unfortunately.
Have a look at
http://www.airquiz.com also, the subscription is pretty cheap and I found it really useful to be able to do on-line exams regularly - once I passed these every time I had a go at the real exam.
I also found the met hard, and probably took longest studying for it before attempting the exam.
You may find that your flight school have the Oxford CDs available that you may be able to borrow.
Alan.