This book is a collection of exercises designed to help learners master Sparknotes' selection of the 250 most difficult SAT words (http://www.sparknotes.com). All the sentences used in the practice questions are adapted from The Free Library (http://www.thefreelibrary.com/), British National Corpus (http://www.natcorp.ox.ac.uk/), Collin Cobuilds Advanced Learner's Dictionary, Webster's New World Essential Vocabulary (David A. Herzog), and How to Prepare For the SAT 23rd Edition (Barron's).