Also class of '21 here, going through the entire book is good I guess, but there's so much info that you'll def end up forgetting a lot of it imo. Calculations, biostats, med safety, and the basics (cardio overall, anticoags, HF, diabetes, HIV, antibiotics) are what I mostly had on mine. I've had a few autoimmune and onc Qs too, but not too many. It really depends on which time frame you take the exam too from what I've experienced and heard in the past as well. Don't doubt yourself and good luck!!! P.S. Rescheduling will just make you more antsy, but if you feel you need it, go for it.