Except as provided in §§ 668.144(d), 668.148, and 668.149, to demonstrate that a test taker has the ability to benefit from the education and training offered by the institution, the Secretary specifies that the passing score on each approved test is one standard deviation below the mean score of a sample of individuals who have taken the test within the three years before the test is submitted to the Secretary for approval. The sample must be representative of the population of high school graduates in the United States.