why is the narrator qualified to help medicle students get a medical degree?

The narrator (Jerome) believes himself to have had most of the diseases he'd read about in the medical book he perused at the British museum. Thus, he saw himself as a walking hospital and an excellent source of study.

"I sat and pondered. I thought what an interesting case I must be from a medical point of view, what an acquisition I should be to a class! Students would have no need to “walk the hospitals,” if they had me. I was a hospital in myself. All they

need do would be to walk round me, and, after that, take their diploma."