Books that are designed for USMLE (US Medical Licensing Exams) Step 2 & 3 are appropriate for your rotation studying.
Some recommended series are:
- PANCE (Physician Assistant National Certifying Exam) Review
- Appleton & Lange Review
- Boards and Wards
- First Aid Series
- Blueprints Series
- In A Page Series
- Tarascon Pocket Guides