...there are a couple of things you might like to consider. Firstly, it is LOADED with typos. This is very frustrating as it makes answering a good number of the problems impossible. Secondly, it is an American publication and as such calls for a good American general knowledge. Be prepared to answer the questions from the point of view of one from the Northern Hemisphere, as alternative viewpoints are ignored altogether.
Because of the above, it really does not do what it says on the tin, i.e. enable you to calculate your approximate IQ, but if you fancy having a go at a pretty good range of puzzles, then it's interesting enough.