A test was devised based on the symptoms exhibited in ADD/ADHD by a psychologist at the University of California - called the SNAP IV Rating Scale. It is based on the questions below, and the answers run from 1 (not applicable) to 5 (Yes, my kid all the time).
It may be helpful to copy this test, paste it into Notepad, and print it out, then mark the scores alongside the questions.
SNAP IV Rating Scale Questions