Flutter app expert

I want to create a flutter app which will provide ielts sample test to practice

There will be screens which will play audio and record audio also have to drag and drop functionality

Screens will be like listening reading writing speaking tests home screen result profile and subscription

It will be like a test in listening one audio will be played and questions are shown on screen. User has to write or select or drag the answers. After completing test score will be given listening reading score will be at time as it will be short answers. But speaking and writing will be evaluated by an expert so score will be updated after some time.

There are 4 tests listening, reading, writing and speaking