Apply for preparation in the Principles of Economic Theory for Pan-Hellenic Exams, which includes correct / error, multiple choice, fill-in and match questions. Each time the application runs, 10 questions are randomly selected from within a topic table, with the goal of making the student complete and effective to repeat it. The great advantage of the application is that in every wrong answer, right after that, the correct answer is fully justified! When the quiz is completed, there are two options: If the score at the end is below the base, (90%) then the student is given the opportunity to repeat the quiz from the beginning. However, if the score is above the base, then all the answers given by the student are displayed in order to identify his / her mistakes and be able to overcome them. In this case, to open a new quiz, the app must be shut down and reopened.Editing of educational material: Giorgos Kamarinos