When you do the Daily Challenge for the first time of the day, difficult words that you need to practice appear. When you redo it, words you already know come up and they just repeat over and over again, in the same order. This means you only have one minute per day to practice words that you really have to work on, and that’s too little. It’s not the same when you review cards flipping them as when you’re tested in Daily Challenge and need to choose a word. It would be much better if you could redo the Daily Challenge multiple times a day, but with words at the same level as when you do it the first time. It would provide a more effective learning experience. The points are not important at all, as long as you get a chance to practice.
And thank you for a great job, may Allah swt reward you for your efforts!