Prova CNH is an Android application designed to help users practice for their driver's license exam on their smartphones or tablets. With over 600 questions available, this app offers a range of topics to choose from, including defensive driving, traffic legislation and signs, basic mechanics, traffic medicine, and environment.

The app features a simulation mode, where 30 random questions are selected, and the user must answer at least 21 correctly to pass the test. Users can also choose to practice all the questions in random order or select a specific topic. In addition, the app provides extra features such as repeating questions that were answered incorrectly in the previous test, indicating whether each question was answered correctly or incorrectly, and showing the correct answer if the user answers a question incorrectly.

It's important to note that while many people use this app as their primary study resource, the developers recommend using additional resources such as books to obtain a comprehensive understanding of traffic laws. Overall, Prova CNH is a helpful app for anyone preparing to take their driver's license exam.