Most agencies give written exams.
As a rule, if you don't pass the test, you are out of the process. If you do, your score may be used to rank you on the eligibility list. The exam announcement will usually let you know how the ranking works. The TEA exam is a written examination that tests your judgment, logic, planning, and communication skills. Some of these study guides have to do with the law and police or corrections procedures, or they may contain photos and drawings for you to memorize.