My employer said something like "it's good to have someone for a longer period in this job, and as you wrote in the job application that you are gonna graduate from university at 2005". LIke, does that blonde bimbo really think I will graduate then if I do 5h/day work and don't sleep enough.. Fat chance.
Some companies exploit students when they don't have to pay them properly or treat 'em well. This one seems like a good deal so if the interviewer is a nice person, tell them how you honestly think this is a great opportunity and that you specially like this company and the experience from this work would be just what you were looking for. Motivation and flattery will go a long way and you don't have to be dishonest.