Of mice and men york notes or cgp?Watch
Personally, I have the York Notes guide, which is decent, but there's only basic analysis. There are some useful exam techniques in there though...like using embedded quotations and stuff.
For the exam, I winged it. Couldn't remember reading the chapter that came up at all. Obviously I would not recommend this though.
If you don't have access to these books via pdf or library, go for CGP. Alternatively visit SparkNotes. Lots of useful info there.