Okay, now I see that you commented out a major part of the code. That is OK. But I do not see exactly where the plist entries such as the categories like Entertainment and values like Eye Balls etc written via code?
In the code, I do not see any such string like "Animal Park" or "Biology Quiz"? Perhaps I am too stupid. Are you getting these from some other file or from some other plist? Where are those? Perhaps I am confused because I did not complete Chapter 9. I had to skip it because in my system (XCode 4.0.2), I cannot edit the plist. It does not open.