This book really boils down the subject of astronomy into a few rules of thumb. It is good to have some rules of thumb nearby to aid your memory, but historically a Schaum's outline has been a challenging yet cheap little tome to get you through the rough spots. This book won't do that unless you are in a high school class. It won't cut it for a college level astronomy class.
I suggest Textbook on Spherical Astronomy as a good aid. Used copies generally come pretty cheap and it is very useful with good solved examples and problems. Once you finish that try out Astronomical Algorithms. The author shows a real love for his subject with some interesting problems in algorithmic form, but he lacks a great deal in explanation.
Used copies of this outline usually cost under one dollar. Thus if you just need rules of thumb in a handy form, this might be worth that much. Just don't pay list price for what amounts to a "Pocket Guide to Astronomy".
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