By far the best guide! More than 400 problems for each section to practice. On my exam july 2013, at least 20 questions from the destroyer were on my test. I got over 90th percentile in the sections that were on the destroyer. Best way is to do the problems without peaking at the answer key. Then look at the explained solution. Even if you got it right! They always give you more information to study. If intersted I am selling mine. No notes on it. Email at
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