Free Study Guide – Texas Special Education EC–12 (161) Exam: Domain 1, Competency 1This free resource is a comprehensive yet easy-to-follow study guide designed to help educators prepare for the Texas Special Education EC–12 (161) certification exam. It focuses on Domain 1, Competency 1, which covers understanding the characteristics and needs of students with disabilities. Inside, you’ll find: A clear breakdown of the 13 IDEA disability categories with definitions and examples. Side-by-side