I would like to point this out from NBOME.
Why did I fail the COMLEX-USA Level 2-PE examination? My medical school course grades and test scores, COMLEX-USA Level 1, Level 2-CE scores, and/or my clerkship ratings are very good.
Candidates should be aware that cognitive knowledge is measured principally by the COMLEX Level 1, Level 2-CE and Level 3 examinations, whereas clinical skills and performance are measured by COMLEX-USA Level 2-PE. The assessment formats of Level 2- CE and Level 2-PE examinations are different, and the examinations therefore are designed to measure different competencies.
Numerous published studies show that there is only a very modest correlation between national clinical skills examinations (such as COMLEX-USA Level 2-PE) and other measures of academic performances (i.e., academic grades in medical school years 1 and 2, COMLEXUSA multiple choice cognitive examinations such as COMLEX-USA Level 1, Level 2-CE, USMLE scores, MCAT scores, and clerkship ratings). Consequently, the fact that a student may have performed satisfactorily or even quite well in an academic or other setting may not predict achievement in clinical skills.
There is extensive literature that documents the low correlation between clerkship global rating forms and other academic measures (e.g., Multiple Choice Question- MCQ- examinations) as well as with national clinical skills examinations including COMLEX-USA Level 2-PE. For research related to the COMLEX-USA Level 2-PE, please see the Research and Resources link on the website.
Here is the Research and Resources Link: