In general, you want to be picking from closer to the top of lists like these:
www.theguardian.com/news/datablog/2013/jun/04/university-guide-2014-table-rankings
(Other papers devise their own lists based on other criteria...)
BUT, some universities from towards the back end of this list will excel at whatever area is their specialty. For example, Abertay Dundee is at 114 (out of 119), but is probably the best place/one of the best places in the UK to study computer game design. Likewise, UC Suffolk at #98 I think is really strong in Education (formerly a teacher training college, probably)*.
And then for degrees, something like computer game design would be great if he wanted to be a computer game designer for absolutely sure, but probably wouldn't impress anyone much if he later decided he wanted to work in banking. A maths degree would help with either.
History (and similar) will prove he can think.
And then also think about where he'd like to live. For example, if he's from a tiny village, the thought of moving to a huge city might be terrifying and a middling sized town a better option. Or he might be desperate for the bright lights. If you're in London now, he might find some smaller towns just too damn small. (My own criteria were direct train line home but far enough away that no-one was going to pop in unannounced.)
*I'm remembering this fairly randomly to illustrate my point. Don't apply to UC Suffolk to study education without checking!