In ETT, you can use different training styles. You can run the standard tests of 33 randomly-selected questions or run through all the possible questions in one sweep.
ETT has a unique feature that estimates your confidence level based on the number of covered questions and the correctness of your answers. The app measures this using three levels: "Low", "Medium", and "High". When your confidence level reaches the level “High", it is very likely that you have a good chance of passing the official exam.
When running a "learning” test, ETT makes sure that you have the chance to see a mix of new questions as well as questions that you previously answered incorrectly. This feature ensures you learn quickly, and you pass at least once through all questions in a relatively short time.