am 18. April 2000
The book is divided into theme groupings such as biology, astronomy, sociology etc. It works on the assumption that the reader will put forth the effort to do all the exercises and match the answers. Checking your answers however is a major hassle because the numbering system and the organization of the answer key is not user friendly at all. Best bet is to photocopy the answer sheet and lay it next to you as you work.
The book's strength is its thematic presentation as opposed to an alphabetical presentation.
My advice, get Kaplan's success with words for the Toefl first and then get this book second.