For years now we have encouraged students to study for Ham exams by memorizing the questions and answers. Just go over and over them until you can pass the test. They get their license and don’t know anything about the material. It is rare for successful exam takers to remember anything beyond a couple weeks.
It is like math students in high school who take a final exam, and forget 70 to 80 percent of it in a couple months.
I try to get the students to think about the questions before choosing an answer. Seeing the answer pop up first thing just shuts down constructive thought about the questions.
My thought would be to show all question answers equally ... then have a button to show the correct answer.