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Thank you Ganesh, for your answer. I understand your bitterness. The college my son attends diagnosed ADD some months ago, but have done nothing to help him. They said they would help him with organisation etc, but have done nothing at all. They nag him about his lack of organisation and concentration, so I said to his personal tutor, "perhaps that's got something to do with ADD". She said "oh, maybe", but still just nags him, the silly moo!
I have ordered the book you recommended, from Amazon and will try to help him myself.
If you come up with anymore advice, I will be happy to hear it, thanks again.