prajwalprogrammer/ExamApp-in-react-native ? reverse-engineered prompt

Build me a simple exam app in React Native, starting from this Expo project.

I want the app to show a clean home screen, let a student pick an exam, answer questions one by one, and then see their score at the end. It should feel mobile friendly and easy to use, with a nice basic design using the existing assets and components folder if helpful.

Since this project says it’s meant to work with a MySQL backend, please wire the app so it can load exam data from an API and submit answers or results back to the server. If you need to, look up the current Expo and React Native docs online and keep the code simple and readable.

Please turn the current sample app into something real and usable, with sensible navigation, loading states, and a basic results screen.