Hi Laura,
Thank you for your forum post. I am unsure exactly what would be helpful for you, but here's a genuine try:
Question 1: probability, odds, conversions, thresholds, calibration, discrimination
Question 2: define C and B, series of net benefit calculations, threshold calculation
Question 3: I would refer to Dr. Kohn's lecture - he outlines how to interpret calibration plots and how they relate to ROC curves. In particular, pay attention to where least/most abnormal are.
Question 4: it is helpful to know and understand the definition of calibration, for part (c) be very specific about how you got predicted risk and observed proportion
I think in general it may be more useful to target specific questions for the forum, as it will assist us in being more helpful in answering questions.
Best,
Kirk