The purpose of this study and practice book, by Patricia Morales, Ed.D., is to help certified teachers study the domains and competencies for the 154 English as a Second Language Supplemental Test. This workbook includes: research-based content materials, resources to review and study the ten (10) competencies included on the test, helpful links to related literature, terminologies, and practice multiple-choice questions to review as part of the teachers’ preparation for taking the test. The practice questions are developed based on the test framework, which is aligned to the corresponding test competencies.