A classic word-building book that has vocabulary expansion even for the logophiles with their large vocabularies. It’s readable and effective even for medium vocabularies. Actually written in the 1950’s, it has been printed since then and sells well today. (The author must have really done something right!) It has small print and many pages though so it is more of a time-investment, but perfect if you have lead-time before your GRE prep course, love to build vocabulary and also want to score high on the verbal part of the test.