From what I have been able to gauge, there will be no questions about listing/explaining steps of a particular methodology(in my interpretation, that is application. Along with drawing UML type diagrams, which isnt really in the scope of this course). The questions will be more comparative, I presume the questions to be like those in the assignments. In particular, I reckon a comparison between RUP and XP is very likely(because they are two of the major methodologies and have conflicting views, and also because of the extra material on myunisa). It would probably be wise to gloss over that RUP vs XP document. The framework for comparison is obviously of utmost importance here.
I also doubt some of the lesser known methodologies are likely to come up(I am meaning the ones with specific application areas such as expert systems). But I think it would be foolish to not at least know that a particular methodology is specifically suited to area X.
As for definitions, the definition of a methodology is probably the most likely to show up.
Themes, techniques and tools is important because of their recurring use in the methodologies. Most of these are fairly straight forward anyway. I guess being able to identify a methodologies characteristics based on the techniques they use would be good. The tools chapters are mostly a waste of time, if you are in the industry you should know it all already(and also that the tools described are very outdated). In that regard, the text book claims to have been revised in 2007 but it keeps referring to the Netscape browser(which was long gone by then). I would have thought they would keep the book current.
I think there will be a few advantage/disadvantage type questions, so understanding the underlying themes/techniques might help with remembering facts about the methodologies.
Note: These are just my observations. Since I too am writing the exam, I have no idea what is actually in it. Dont hold me to it.