This app was mentioned in 2 comments, with an average of 1.00 upvote
Android app - https://play.google.com/store/apps/details?id=air.com.snatco.hamradio
iOS version: https://itunes.apple.com/us/app/ham-radio-quiz-foundation/id905849343
Android version: https://play.google.com/store/apps/details?id=air.com.snatco.hamradio