Congratulations on your acceptances! I'm a first year here and I absolutely love it, I'll try to start checking back here every once and a while to answer your questions. I know I used SDN a lot to learn more about SB before I came. In response to the mandatory lectures, no, lectures are not usually mandatory. Small group sessions and most of our Foundations lectures (which is Clinical Medicine, Human Behavior, Ethics, Nutrition and Epidemiology/Biostats all rolled into one class) are mandatory, but the science lectures are not. I generally do go to lecture, but if I feel like sleeping in I can and it's easy to catch up using the transcripts and the audio. What you may be thinking of with the quizzes though is our Biochem class. 6% of our final grade this year was made up of our responses to little Jeopardy style question sets that we got at the end of lectures, we have remote control "clickers" to answer with. So I guess if you never went to lecture you would lose that 6% of your grade, but I think some people were still willing to take that hit. I'm not sure if they are going to keep that the same for next year though...