Knowing the format before test day saves energy for the questions themselves. Each test has its own order of parts, timing, task types and rules about breaks and equipment.
These articles explain the format of IELTS, PTE Academic, PTE Core and OET, what happens on test day, and how computer and paper versions differ, so nothing surprises you when you sit down.
OET for nurses explained: the four sub-tests, official timings, what grade B means and a step-by-step plan so one weak sub-test does not delay registration.