FahrAPP questions are displayed until you have correctly answered them twice. If you have answered a question one time correct and then one time wrong, you have to answer the question correctly 3 more times in order for FahrAPP to evaluate the question as answered correctly twice.
The exam also shows you exactly these questions first. Our exams are structured according to official rules, must be exactly of all given subject areas, and e.g. number of picture and video questions is determined.