The questions in this book are very thorough and effective for studying for the regents. Although the questions are great, rarely does old regents questions appear again on future exams. However, I found The Ultimate Study Guide for Biology: Key Review Questions and Answers with Explanations, Volume 1, 2 and 3 by Patrick Leonardi to be a great resource for test preparation for the Regents. This is because these 3 study guides even have some harder questions compared to what is asked on the regents. For me, I found the secret to really doing well on this test was to study also even harder questions like the ones from The Ultimate Study Guide for Biology: Key Review Questions and Answers with Explanations. This is because if you just prepare for the regents by studying your typical high school biology book, sometimes the harder questions that are asked on the Regents are hard to figure out. This is where Leonardi's book helped me greatly.