The work experience will be useful to give him a flavour of working life but in my opinion its too short a period of time to provide any long term benefits.
My main advice would be (assuming he pursues the university route) is to make sure he proactively applies for summer internships or possible a placement year with a company in a related field. All the analysts that have joined the firm I work for in recent years have undertaken placement years. They are by no means a necessity but it does seem to be an increasing trend.