Internships arent commonly offered in the consulting industry - they are essential to secure a position in banking or insurance, but they wont add any significant benefits in a consultancy application. Essentially any relevant work experience will help, in any sector, if you are intent on securing an internship. In reality no one will be learning anything significant during an internship - it's really about providing assurance within specific sectors that you are accepted by one firm therefore meeting some vague sense of baseline suitability.As Senior Mick suggested, go do something interesting - it will add to your CV, provide a talking point in interviews, and make you a more rounded, interesting and balanced person. If you really do want to do something to prep for MC applications then maybe look at some online excel courses to polish up on those skills (you'll need them). Oh and dont forget to enjoy yourself! Last summer before you graduate - you wont get this much freedom again for some time so make the most of it.