MoveTrainer® implements the concept of spaced repetition, which incrementally increases the amount of time between revisions. If you get things right, the timing between revisions increases. If you get things wrong, you are back to the beginning and the timing until the next revision reverts to a shorter period of time again. Here are the approximate times Chessable uses:

Level 1: 4 hours - +40 points earned
Level 2: 1 day - +50 points earned
Level 3: 3 days - +60 points earned
Level 4: 1 week - +70 points earned
Level 5: 2 weeks - +80 points earned
Level 6: 1 month - +90 points earned
Level 7: 3 months - +100 points earned
Level 8: 6 months - above 100 points earned

If you get above 100 XP points on a move, it means that you've correctly guessed another Level 8, so in theory, if you get Level 8 right 10 times, you could earn 200 points per correct answer. Each move in a variation has its own timer, so you can be at different levels within the same variation if you have got one move incorrect a number of times.

It's optimal to study soon after the revision becomes active so that you make the most out of spaced repetition's benefits. However, if you are a bit late, or a few days late, don't worry. At worst, you will get a position wrong, and it will revert back to Level 1. That's okay though. Much better that you get it wrong in your study, than during an actual game!

The spaced repetition method of studying has long been known by scientists to be the optimal way to learn and remember. It might seem a bit repetitive at first, but once you get to Level 8, you will not be bothered by the same quiz again for a long time to come... as long as you solve it right!

As Chessable grows, we look forward to improving our spaced repetition algorithm even more and offering you alternatives where possible.