The inattentive type of ADHD has symptoms manifest as forgetfulness, poor focus, organization, and listening skills. It can also cause issues with giving close attention to details or following through on instructions and finishing tasks.
The symptoms of the Hyperactive-Impulsive ADHD sub-type encompasses many traits such as hyperactivity (as the name suggests) interrupting conversation or class, constant fidgeting, excessive talking, difficulty waiting during turn-based situations, and feelings of restlessness.
The combined inattentive/hyperactive/impulsive sub-type occurs if a person has six or more symptoms of both inattentive and hyperactive-impulsive ADHD.