What does the OSAT scoring system primarily depend on?

The OSAT scoring system primarily depends on the number of correct answers. This method allows for a straightforward assessment of a test taker's knowledge and understanding of the subject matter covered in the exam. Each question answered correctly contributes directly to the overall score, reflecting the candidate's competency in the tested areas. Additionally, this scoring system is common in standardized testing environments, as it provides a clear and quantifiable measure of performance.

While the other options touch on different aspects of performance, they do not align with the fundamental way the OSAT calculates scores. For instance, overall performance compared to peers may be considered in a norm-referenced context but is not the primary method for calculating scores on the OSAT. Percentage of correct answers, while related to the number of correct answers, does not inherently reflect the scoring process, as the actual score is derived from the total count of correct responses. Lastly, completion time on the test can affect test-taking strategies and overall test experience but does not influence the score itself, making it irrelevant to the scoring mechanism.