Where you are
Reading your work
Carry on
Opening You
Your questions, your topics and your predicted score all change with this, so it asks before it changes anything.
Answering does not switch anything on its own — the consequence is put to you first, and giving up on that question leaves you where you are.
Your progress on each licence is kept separately and picks up exactly where you left it. Switching pauses the other one rather than ageing it.
Each licence keeps its own progress. Switch away and it pauses; switch back and it carries on from exactly where you left it, with the same answers, the same run of days and the same predicted score.