If you are an opponent of the Police, this app may interest you, you will find a compilation of official knowledge exams, with which you can rehearse and practice to prepare your opposition, such as Local Police, National Police and Civil Guard.
You can take the tests in question-answer mode or exam mode, it has a section to review spelling and you can even check graphs of your progress as you progress.
In the configuration option, you can set the time for exam mode, turn on or turn off sound, adjust the size of the texts.