If you studied with people during first and second year, I would continue doing so. If you are used to studying on your own, then I would continue studying on your own. Some people do find it useful to have people going over the same topic as them in close proximity to help them keep motivated and so that they have someone who can answer their questions. I definitely found that it helped to study around other people for conversation breaks, but I got most of my work done independently. I think most of your studying should be on your own with other people around, to make sure that you are really learning the stuff and one to two people aren't dominating the study group. Also, make sure that your study partners are not slackers who are going to de-motivate you from your studying by wanting to talk all the time or something. I think that it's useful to study with people who want to spend more time studying then you do, so you feel guilty about taking breaks and not studying as hard.
