I do not think that your son has a learning disorder. Perhaps a change of school might help.
Reading text books only can be boring. Get him colourfully illustrated story books, which he will read for the sake of the story. Gradually his reading will improve.
He probably has strengths in sports, music or art. Give him an opportunity to spend time in one of them, and to excel. He needs the satisfaction of being very good at something.
Organisational skill can be taught. Now that you feel that it is a problem, please also think of how to teach him to be more organised.
If you like, you could consult a Psychologist or Counsellor, if such a person is available.