Just a thought: I am soon wrapping up my fifth year in university (two B.S., applied math, physics), and I have always used an inexpensive, used (retired), business-class laptop from eBay - they have always been sufficient for my work, and my emphasis is computational physics.
My best recommendation is: find a used business-class laptop on eBay, with a dual or quad core i5 (in the $100 to $250 range), spend $100 on a decent 250 GB SSD, spend $80 on a decent external HDD, and have him keep always an up-to-date image backup for the event that the laptop dies, and just move the SSD over if you have to replace a dead laptop.
In 4.5 years at uni, I have used two laptops total, and I have spent no more than $500 in total (on laptops, not counting my gaming machine 🙂 ).
Z
EDIT: In response to CUNIAC's statement about graphic design: If that sort of thing is what he will be studying, then the school will have MUCH more powerful machines at his disposal for that work. That type of computer isn't one he'd need for word processing.
EDIT: To clarify the first paragraph: my emphasis is in computational physics, and I didn't start using my desktop for work until I needed to learn parallel processing for a project to study the precession of the perihelion of Mercury.