Met isn't that bad. I did it recently and, as FFF says, if you've learned the basics then there is nothing bad in it. However, if you've just learned the Confuser answers (which is enough for, say, Perf. and Planning or Human Factors) then you'll struggle to pass.
The one that I had has a couple of tricky questions, and a couple more that are 'anti-Confuser' questions - e.g. the Confuser asks what happens when a Cold front passes and the exam asks about a Warm front. As long as you can understand air masses, fronts, lapse rates (and how they affect cloud formation, especially Cbs), TAFs/METARs and Forms 214 and 215 then you're most of the way there.