That’s the standard amount of furniture allocated to a kid living in a dorm – single bed, desk, dresser, closet. It is actually a pretty minimal set up. Your problem is your kid is in a single rather than the more standard double set up.
You could loft the bed to pick up some space. Or go for a double.
But I bet your kid (if he’s like most male college freshmen) is thinking about all the advantages/possibilities a single will provide him. : )