Tap an answer and it is marked at once — green if it is correct, red if it is not.
Some questions have more than one correct answer. Mark every one you think is right, then press Next. If you missed any, Next shows you the full answer before it lets you move on.
Anything you get wrong — or only partly right — joins your review list, and leaves it once you answer it correctly in two separate sessions.
Each bank keeps its own progress, review list and stats.