Pushing on through Challenges 13-14 is the best thing I did. The phrases are repeated and embedded multiple times in the following challenges so I certainly think that helps if you were to repeat challenges 13-14.
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It’s sometimes worth dividing a challenge in half, leaving the second part until tomorrow. Each challenge is very intense. Think about it: you have to respond about 5 or so times per minute, so within one challenge that’s roughly 150 responses in a new language in half an hour. That’s very intense.
Also I found that taking a complete break from it for a couple of days often helps.
And yes, pushing on and then coming back to it is also a good approach.
And any combination of the above.
Whatever works is right for you.
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Thanks for sharing your woes last year this has helped me with wondering whether to go on or go over the challenges first. 
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