The Washington Educator Skills Test Basic (WEST-B), an assessment of basic skills in reading, mathematics and writing. It is a requirement for admission to PESB approved teacher preparation programs. Passing the WEST-B is also required of persons from out-of-state seeking a Washington State residency teaching certificate. The WEST-B consists of three subtests that measure the basic skills in reading, mathematics, and writing. All three subtests must be passed to meet the WEST-B requirement.