Mark how many days you have until your ESL test to study on your desktop calendar. Both the ExCET and TExES are extensive tests and you'll be better off with just thirty minutes of study a day for weeks, as opposed to an hour's long cram session just days before the exam.
Download a study manual and practice study test, depending on which exam you are taking. These documents can be found on websites like the Association of Texas Professional Educators, Test Prep Review and TExES Study Sessions.
Make a list of the different components of the test you are taking, such as various levels of grammar, punctuation and pronunciation. Prioritize the list in the order you wish to study, moving the components you feel least confident in earlier in the list.
Set aside time to study every day, even if it is only for fifteen minutes. Go through your list and the study manual, taking the section of the study test you downloaded that corresponds to each component. If you are still struggling with a particular component, download more practice tests from earlier years. You can also use one practice test if you are studying for another; the TExES and ExCET focus on the same skills set an ESL teacher will need.
Find out exactly what type of sections are on your test. While most ESL tests in Texas are multiple choice, test formats change regularly, and some tests include essays and short answer questions. If your test includes these types of sections, practice writing essays and short answers at least two weeks in advance of the exam.
The day before the ESL test, only engage in light studying. If you have been steady in your approach, last-minute cramming will not benefit you and may actually cause you to second-guess yourself. Focus on getting a good night's sleep and eating a good breakfast before taking the test.