Android quiz app - add features to app

Hello, I need few features to be added to a quiz app and improve the overall experience. The app uses SQLITE database 1. The answers as of now are shown after each question. I want the answers to be saved to shared preferences and shown at the end. 2. The questions can have more than one answer. Based on the database question, if there are more than one answers, the checkboxes should be shown instead of radio button. 3. Based on the type of exam, the activity needs to be reused. Most of the code is already there, it needs to be called again. 4. The previous button needs to be connected to navigate to previous question 5. For each question, add a checkbox to mark the question for review at the end. At the end, the user can click on a button for review and the button should show questions marked for review and the answer can be changed. 6. Also, any answer can be changed at the end. I can share the code and answer if any questions.