He had bad grades because his was kicked out when he was living with his mother in Miami, his pops Eddie Brown was still playing Arena league ball somewhere & Antonio was basically living with friends & family around the hood. He was actually coached by TY Hilton's dad in little league, he's a Liberty City Gwen Cherry boy. He was a beast in HS but his grades & test scores were just too bad he couldn't get in anywhere.
He ended up going to a Prep school in North Carolina, NC Tech (which is a known fraud program that does a lot shady business in trying to get kids with bad grades & that come rough backgrounds & have no other options).
He was supposed to go to FIU but got into a fight & was never officially admitted, then a WR's coach who recruited him at Norland brought him onto CMU as a Walk-on with Butch Jones.