CR Educational Services provide online and F2F TExES Principal Review Seminars for students in Texas attempting to pass their Principal Certification Exam. In addition, we have the TExES Principal Toolkit and Study Guide with the most up to date study information available. Also, we have online independent study courses for Domains 1, 2, & 3. We also provide TEA Waiver coursework to allow for continued preparation and fulfillment of Waiver requirements. History Established in 2015. Our doctorate level faculty found a need for quality and affordable preparation materials for individuals seeking to complete the TExES Principal Exam. Working with developers, this process has come to fruition.