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Here are the most popular resources that people use for the USMLE Step 2 CK on Cram Fighter. These aren't necessarily the best study resources, but they should be a good starting point.

Rank Title (all editions) % of students used
1. UWorld 76.5
2. OnlineMedEd 36.2
3. Master the Boards USMLE Step 2 CK 31.5
4. First Aid for the USMLE Step 2 CK Clinical Knowledge 19.8
5. USMLE Step 2 Secrets 17.2
6. Step-Up to Medicine 12.5
7. Anki 8.2
8. Master the Boards USMLE Step 3 5.6
9. Kaplan Qbank 5.4
10. Step-Up to USMLE Step 2 4.7
11. Kaplan High Yield Lectures 4.5
12. SketchyMedical 4.3
13. USMLE Step 2 CK Lecture Notes: Internal Medicine 4.1
14. Kaplan OnlinePrep Lectures 3.9
15. Firecracker 3.9
16. Case Files Family Medicine 3.2
17. Dr. Pestana's Surgery Notes 3.0
18. USMLE Step 2 CK Lecture Notes: Surgery 3.0
19. USMLE-Rx Qmax 3.0
20. Flashback 2.8

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