Bestselling self-study guide geared to the adult student Research shows that in 2001, 44 million adults did not have a high school diploma and more than 1.2 million individuals took the 5-subject GED test battery. The latest edition of this guide is designed not for full-time test takers with a lot of time on their hands but for adult learners who have to squeeze studying into their busy schedules. In addition to the usual Success features, such as RED ALERT test strategies designed specifically for people who've been away from a classroom setting for a while, it features: