The difference between USMLE Step 3 and USMLE Step 2 CK
Step 3 wants to make sure you can work alone, unsupervised. While the CK exam just wants to make sure that you can assimilate the clinical features and make diagnosis and management under supervision (like working as an intern).
The USMLE Step 3 is very similar to Step 2 CK except that it focuses more on the management and clinical judgment rather than on diagnosis and the pathology of diseases.
Step 3 wants to make sure you can work alone, unsupervised. While the CK exam just wants to make sure that you can assimilate the clinical features and make diagnosis and management under supervision (like working as an intern).