Feedback on my Flutter app

I recently published a app that allows people who wish to study abroadbot to prepare for the IELTS exam which is required for proving your English language proficiency.

I used Flutter for the UI and firebase for the backend.

My main goal for creating the app was to create a ad free interface where people can actually learn something useful. since playstore has so many such apps and I tried most and they are filled with ads and had very little to offer but over a million downloads.

I tried to create the app in the most simplest way possible.

You can find it on the playstore

https://play.google.com/store/apps/details?id=tech.ieltsvault.ielts

I appreciate all the feedbacks.