Questions you have answered come back here as they fade: a miss straight away, a solid answer days later. Weakest and longest-unseen first, up to 40 a session.
This session takes the 0 most pressing, untimed, with the answer and explanation after each one.
The queue fills from questions you answer anywhere in the course. Answer a few, and they come back here when they are due.
Go to PracticeEverything you have answered is holding steady. Each question drifts back into this queue a few days after you last got it right.
Practice something new