A slight improvement
Who wants to sit through 20+ questions to then have to go back and read them all again to see what you got right and wrong? You should instantly let the user know what was the right answer is once they choose their answer and click next to move on, that way even if you don’t complete the test you can get on with whatever it is you need to do without being forced to feel like your actually studying a subject, this way you’ll actually gain knowledge each time you go on the app if you have a short attention span like me.