Ritalin is prescribed for ADHD, since it aids in concentration and reduces hyperactivity. This also makes it useful as a study aid and for improving performance in exams for both ADHD and NT individuals. The names can be a little confusing; each drug has a generic name (in this case methylphenidate), and one or more brand names (Ritalin, Concerta, Daytrana, Metadate and Methylin).