What's the best self-study book for statistical mechanics?

[AxiomOfChoice]

I have to take that next year and am nervous about it. I took it as an undergraduate, but most of it went right over my head. Now I have to take the graduate-level course. Can anyone recommend a good book for me to read in preparation for that class?

 

[malawi_glenn]

Mandl's book is superb - Statistical Physics

Then you should be fine doing an more advanced class.