Matthew Georgiou was having trouble in school. “He wasn’t listening,” his mother, Melissa, told The Post. “Teachers were saying, ‘Look, he’s a smart kid, he’s just not paying attention in class.’” What first seemed like defiance had a far more troubling explanation — the young Australian simply couldn’t hear. Like his older brother Nicholas, Matthew was struggling with Eustachian tube dysfunction , a condition in which the small passages connecting the back of the throat to the middle ear don’t