Is the ASVAB based on a fourth grade level?

No, the ASVAB is not based on a fourth-grade level. While some of the basic arithmetic sections might involve concepts learned in elementary school, the overall test assesses aptitude and abilities far beyond a fourth-grade level. It covers a range of topics including more advanced math, reading comprehension, and spatial reasoning. The test is designed to predict success in various military occupational specialties, many of which require a high level of skill and knowledge.