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I would recommend this study guide when you are ready to take the COT exam. This book contains multiple choice questions and give you the answer key in the back of the book. Helps you focus on the weak areas.
It's not really a study guide; it's one big test. If you are looking for a textbook, you will need to look elsewhere. This works better if you have already studied and ready to take the test.
Excellent review - very detailed and the explanatory answers help you to work on weak areas :-)