ADHD is neurological in origin, so signs of it are observable before a child begins school. Adults with attention disorders may encounter problems with college work including difficulty concentrating or focusing, difficulties organizing studies, procrastination and marked slowness taking tests. Attention deficit is a childhood diagnosis. If you didn't have it as a child, you don't have it now. However, you may have had it as a child and never been diagnosed.
Most college students report difficulties with concentration at one time or another.
A large number of medical and psychiatric conditions cause problems with attention and concentration. Anxiety and depression are common conditions which cause concentration problems. A weak academic background, lack of college-level study skills, and test anxiety, among other situations, may cause these symptoms. Accurate diagnosis is important. Like most people, you may improve your academic performance through different kinds of self-education, tutoring and counseling.