Study Strategy
I used "Pass the TExES Theatre Exam" by Eileen Eberhart (more useful for the approach to studying than actual study material), Brockett's History of Theatre, and Campbell's Technical Theatre for Nontechnical People. Familiarize yourself with some educational vocabulary, like "cooperative learning" or "scaffolding" because there will be some pedagogical questions. This test does require preparation, so hunker down for some disciplined preparation time. Of the three broad areas (teaching, technical and theatre history), take some practice tests (online or from your ACP organization) to determine your weakest area(s) and study up on those. Overall, I spent about an hour each weekday over 4 weeks, I gave myself the weekends off.
Testing Strategy
The test is 100 multiple choice questions (only 80 of which will count; the other 20 are pilot questions that they are testing out). Most of the technical questions and theater history questions are straightforward, you either know the answer or you don't. Many of the pedagogical questions require a little critical thinking. Read the questions carefully; there is a reason they are using certain words and noting these words can help you eliminate wrong answers. I used 2 of the 5 hours given to take the test. I made a first pass, noting the questions about which I was uncertain. Then I made a second pass, focusing on those uncertainties. My final pass was just to make sure I was satisfied with all of my answers. The scaling of scoring is very confusing. If it's helpful, I missed 6 questions out of 80 and my scaled score was 275 out of 300. Good luck!