Yes, there is a way to reset your scores back to zero and start again.
Firstly, take a look at how to reset a complete lesson, because you're going to need to know how to do that.
Then you will need to go the language home page, where you have access to 3 special lessons:
- Dutch Known (or whatever language it is you are studying), which is the lesson which contains every entry (word or phrase)
- Words Known, which is the lesson which contains every individual word
- Phrases Known, which is the lesson which contains every phrase (two or more words)
By clicking on each of these numbers, you can go directly to the Mastery tab for each of them. Here you can reset the entire lesson, and therefore you can reset your entire score back to zero.
Be careful that's really what you want to do, because your score will start again from zero and you'll have to redo all the entries.
Used carefully, this can be a great way to revise everything. No doubt the second time through the content you'll whizz through much faster than the first time you went through it, so it can be a great way to do revision.