Purpose of this tutorial is to familiarize you with the mathematical (Data Analysis) skills and concepts likely to be tested on the Graduate Record Examinations General Test. This material includes many definitions and examples with solutions, and there is a set of exercises (with answers) at the end. Note, however, this review is not intended to be comprehensive. It is assumed that certain basic concepts are common knowledge to all examinees. Emphasis is, therefore, placed on the more important skills, concepts, and definitions, and on those particular areas that are frequently confused or misunderstood.