- "Sharp Vocab" features:A 12-question diagnostic quiz to show readers where they need the most help. Topics broken down by subject to make it easy for the reader to group concepts together for easier memorization. A variety of practice exercises with detailed answer explanations for every topic. A 30-question recognition and recall practice set that includes material from the entire chapter, (and a few questions that cover material from the previous chapters) to once again reinforce what the reader has learned on a larger scale. Detailed answer explanations that follow each practice set.