Ryan Manley was diagnosed with attention-deficit disorder in seventh grade, but when he enrolled at Texas Tech University as a freshman in 2014, he was tired of using medication and accommodations to treat it. He decided to try to make it on his own. It didn’t go well. He fell behind on his assignments and eventually became so discouraged that he stayed in his dorm room most of the day. Midway through his second year, the university declared him academically ineligible, he says. "I took a lot of classes," Mr. Manley says, "but I didn’t pass a lot of classes."