Some good advice here. But another point worth mentioning is try not to let others stress you out. You are in a class full of bright individuals. Do your own thing and stick with study habits that work for you. Some people will study for five nights to get an A, where others only need to study for one night. As for myself, I cram, but I'm pretty good at it. So at the beginning when I heard people talking about studying every night, it got to me a little and stressed me out. It made me question my abilities to cover the amount of material in the time I was giving myself. But now when I hear people stressing about a test the following week, I just tune it out. I continue to do what works for me and I'm very satisfied with my grades.
Another thing. In pre-clinic when working on projects, don't let the work speed of others affect you. I always feel behind in lab because people around me get things done much faster. But after discussing practical grades, I usually do better than them. So just do you and go in on weekends to practice if you feel you need it to gain some confidence. Confidence means a lot in dentistry.