This Official Guide from GMAT outshines all others, simply because the questions are chosen from actual past tests and are very thoroughly researched. Equally important the answer choices for each question are also well thought out and both the correct and the incorrect choices reflect actual test patterns. The explanations for the answers in the Official Guide are crystal clear and very insightful.
The rules of grammar on which the GMAT Sentence Correction questions are based are best outlined in this guide. The section on Arguments is simply outstanding.

The well-known author of our best-selling How to Study Program shows students of all ages how to write a winning paper when there's simply too little time to do it the "right" way. This is a book about the reality many students face.

Part of a non-fiction series written and designed in a magazine-style format for today's learner. Each dossier offers a range of language styles, subject matters and visual impact and includes short stories, articles and interviews, maps, cartoons and fact-files. This book looks at Europe, a continent changing rapidly. It examines European history, life in Eastern Europe, the EC and the "super Europe" of the future. There are also reports on European life in general, focusing on language, cities, culture and great Europeans.