Review the stages of primary language development. The Child Development Institute notes primary, or native, language development stages beginning at six months of age and continuing through eight years. Learn these stages so you know how to recognize where a student should be in his language development process.
Learn the stages of secondary, or "L2," language development. Children develop secondary languages differently than they develop a primary language. Know the stages of "L2" development so you can assess where students are in the process and can adjust instructions.
Review the domains and competencies required to pass the ESL Supplemental Exam. Visit the TExES web site and download the 154 ESL Supplemental exam preparation manual. Third party study guides are also available from bookstores and online.
Take a practice exam. The TExES exam preparation guide includes sample test questions and answers. Third party web sites and study guides also include practice tests and most list the answers and explanations.