Relative performance on the Test of English as a Foreign Language Sample Test (TOEFL-ST) was explored in sixty native English speaking high school students. Subjects also were administered the Fullerton Language Test for Adolescents and the Peabody Picture Vocabulary Test Revised. The TOEFL-ST was not difficult for this population, indicating that TOEFL tests taken by foreign speaking college students probably assess a level of native English competency well below the high school level. The three tests, including subtests, appear to measure a wide array of subdomains of language competency. The data do not support the conclusion that any of these tests could be substituted for the others in assessing language competency.