Group work isn't meant to teach you team work, it's meant to teach you how to deal with shitty coworkers and people in general. In college I always had to do every group assignment by myself. It sucked, and I was super angry, but it taught me the lesson that that's just how life is. People are incoherent, incompetent, clumsy, lazy, unskilled, bumbling idiots, and if you want something done right, you have to do it yourself.