Revisiting difficult exercises

In learning in general it's helpful to revisit problems which you struggled with in the past to make sure you've overcome the past difficulties. I think it would be good if the site had a page with a list of exercises the user didn't solve easily, in this order:

- The user had to show the actual solution, starting with those where they revealed the greatest percentage of pieces.
- The user solved the Parsons problem solution
- The user had to request hints, starting with those where they got the most hints

Clicking on any such exercise in the list lets them easily redo the exercise as if they were doing it for the first time, including hints/solutions and the text steps that came before.

Any thoughts on this?