ADD stands for Attention-Defict Disorder, or more commonly known as ADHD, where "hyperactivity" is added. OCD is Obsessive-Compulsive disorder. I suffer from both ADHD (my grades drop because I can't focus; I'm not aware of my surroundings, etc.) and also OCD (everything I write has to look perfect; if I rip or smudge paper I need a new sheet).
The person below me has a collection of pencils at home.