DES MOINES, Iowa (AP) — A popular app that lets users take a practice Iowa driver's license test is available by e-book.

The state Department of Transportation says the app that was already available via other electronic devices will now be an option for Kindle users.

Officials say the app will generate 25 questions randomly from among 69 questions. Each test generates a different set of questions, and users can take the exam as often as they want.

The app tracks scores and indicates if a user has passed or failed the test. Officials say it's a good strategy to study the state's driver's manual before taking the test.

The free app is also available for iPad and Android devices.