Swift developer to improve a Quiz.

I am looking for an experienced Swift developer with good UX knowledge to help me improve my app, which is at a very early stage. The aim of the app is to help students prepare for specific exams. The app will basically be a quiz. I need help achieving the following functionalities: + User selects one (out of twenty) subjects; + App presents question after question to the user until all questions for that subject have been seen; + User must select only one response (out of five options); + App has a timer for each question (if the timer expires, the question is marked as wrong); + User selects a response and the app provides immediate feedback and moves on to next question; + The score is visible at all times at the top of the window (close to the timer); + When the user decides to exit the training mode (or sees all available questions for the subject) a report is generated presenting the score and the details of each right and wrong question.