I found Met quite difficult (still do, in fact). What I did was to just practice every day; go to the met office website, download forms 214 and 215 and look at the TAFs and METARs. Compare them to what you see out of the window, and think about how the TAF relates to what form 215 is showing you. Think about planning flights - would you go flying? You can also download some of
Irv Lee's weatherwatch articles - they're very good. When's the book coming out Irv...?
Apart from the odd question it's a fairly practical exam - but Thom is full of waffle about the Foehn effect, adiabatic lapse rates and katabatic winds that just confuses things. Stick to the practical side of things and you should be fine
