Hi @Namu,
Welcome to the community 
I suggest to watch this video made by Nathan! ( @theadaloguy ) : Adalo quiz tutorial - make a database driven true or false quiz (without multiple screens) - YouTube
Because my first app also a quiz app and this video helped me a lot to create that! You can find my app here : My First App In Adalo - Quizzy
And I added this to your app too : PopQuiz
Hope this helps!
Thank you