One of the challenges that some students with three-year undergraduate degrees have is that some masters degrees require four years of undergraduate study. ESCEM, the AACSB-accredited 'Grande Ecole' business school in Poitier and Tours, has a solution. It has a one-year BA in international business for people who have already completed some years of undergraduate study, with at least one year in a business-related area. See more at http://www.escem.fr/en/programmes/full-time-programmes/baib/

Another great example of a one year top-up BBA, also from a French school: https://www.esdes.fr/en/welcome/programs/bachelor-in-business/  

Great idea for somebody interested in working in France - spend a year there, work on the language, and then another year for an MBA / MSc.