As a sort of disclaimer, "diagnosis" is a much stronger word than what is meant.
ADD seems to be an umbrella term. Where does one start with self-diagnosis? Or what macro-level categories are there (to further observe oneself for certain characteristics or traits). An outline is probably the best way.
I do not mean "disability" as an excuse for lazy university students who do not try. Furthermore, please assume that 'study skills' (organization, time management, note taking, etc) are average or above average (since this also factors into academic performance).
EDIT: This question applies to many people. Labeling something is not the same thing as "self-help." The question is specifically phrased to not ask for opinion based answers. Furthermore, noting the Hawthorne effect does not necessarily cause altered behavior.