National Learning Corporation has been a leading publisher of test-preparation Passbooks(R) for more than 50 years, with 6,000 titles available across 22 series. The DANTES Subject Standardized Tests (DSST) are comprehensive college and graduate-level examinations given by the Armed Forces, colleges and graduate schools. These exams enable students to earn college credit for what they have learned through self-study, on the job or by other non-traditional means. Each study guide contains practice tests consisting of hundreds of multiple-choice questions and answers.