Many (if not most) adult learning classroom/study spaces are terrible. Many community-based programs are located in buildings that weren’t designed for teaching or studying, and the rooms used for classrooms may lack comfortable seating, decent lighting, and other basic comforts. I don’t know to what extent the lack of decent space impacts one’s ability to study and concentrate, but I assume it must to some degree.
There are exceptions—some programs are based in schools and colleges, of course. But designing spaces specifically for adult literacy students, whether that includes multi-level classrooms, private counseling areas, full accessibility for disabled learners—or whatever else makes a space more conducive to adult learning—is rarely discussed.