21 of 25 people found the following review helpful
2.0 out of 5 stars
Waste of Time, 12 April 2008
People should learn from their mistakes. Although the answers to the numerical tests are listed within the book, there are no EXPLANATIONS as to how to solve the problems! Therefore, how can someone improve if they get an answer wrong and do not understand the steps that must be taken to produce the correct answer? This has led to frustration.