cleverfox10

The Course Challenge isn't a test that you either pass or fail. Instead, it gives you Mastery Points for that course, and if you miss 1 question, you won't level up in that skill, but you can still...

1. Comunidad
2. Study Group
3. need help

This is probably too late to be of any help to you, so sorry about that, but if other people have a similar question, I hope this helps them!  Here are some tips on the fastest way to finish a Khan...

1. Comunidad
2. Study Group
3. How to quickly(but efffectively) do a Khan Academy course? I'm preparing for a upcoming math exam at the end of January.

I agree, it would be really useful when looking through other people's questions in a course or a video/article to be able to see which questions are unanswered, or to be able to "close" a question...

1. Comunidad
2. Feature Requests and General Site Feedback
3. ‘UNANSWERED’ filter in questions tab