01
Obstetrics
Yield 42-50%02
Two clocks run at once: the menstrual cycle and the pregnancy timeline. Most shelf questions are really asking which week, which hormone, or which layer failed. Every Bone Wizardry OB/GYN deep-dive, mapped by theme. (A focused starting set, growing.)
Anchor on timing and anatomy: trimester, cycle phase, or the exact layer/structure named in the stem, then the next step.