Study groups can be either a great way to study, or the worst way to study. The key is to find people who really want to study and are willing to put in the work. When I went to IU I had a great study group. Had I not had them I know I would not have passed micro. When I was at Purdue, I had a study partner who is a great friend of mine and it seems like all we did was chit chat. I found it better to study on my own because we could not get our work done together.