Once you've finished this quiz, you'll be more familiar with the future perfect tense.
Not every language probably bothers with this, but it makes useful sense to have a tense that reaches forward to a point in the future and expresses what 'will have been done' by the time that moment arrives. There may well also be an element of the Continuous in it. 'Once you've finished' with this Quiz, you'll be a 'dab hand' at establishing deadlines on your future plans!