I remember the horror of walking into my son's shared kitchen and how sticky/dirty the floors were. Dirty dishes etc. His room was fairly decent so we spent our brief visit in there. I do remember when I moved out of my parents home - never to return, at 19 years old. I had a roommate initially (my brother) and things got messy at times
RE: School Issues
Remember once last year (during freshman year) he called and sounded quite serious, "This so & so course is pretty hard!" I remember kidding him something like, "Oh, college a little more challenging than hs eh?"
He raised his voice slightly and said, "I'm not kidding, this stuff is really hard" 
I said, "Calm down, calm down, it will come to you eventually" This, his second year, I haven't heard any complaints thus far. They say the brain is like a muscle and gets stronger the more you use it. I think these kids learn that over time.