Hi! When I start studying to get into the dentist program back home (in 2006), I studied by myself, and others students from my class created a study group. To make the story shorter, I was the one with highest score (91) and the first one on the list to get in the program. Study by yourself have pros and cons, pros: you can follow your own pace , start and finish whenever you like. Cons: if u need a second opinion you don't have anyone to ask right away. In my personal experience study group slows me down in my learning process , as I said , you can follow your own pace. Hope this help. Good luck with the exams!