This would be awesome! I know someone mentioned that there's a YouTube playlist of all the skills needed to pass the GED, but having a dedicated course solely on the GED would be more convenient an...

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2. Feature Requests and General Site Feedback
3. Request: Add a Free GED Prep Course on Khan Academy

This would be an awesome feature! To me it's very instinctual to hit Ctrl + Z to undo something rather than hit a button that does the Undo function.

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2. Feature Requests and General Site Feedback
3. Exercise drawing tool undo shortcut

I would love this. Might be tough for multiple-question problems, but this would be very useful! Even if the answers just bound to 1,2,3, and 4, it would make things way easier especially if you ha...

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2. Feature Requests and General Site Feedback
3. Keyboard shortcut keys.

I think creating custom questions that a teacher can supervise over would be interesting. This would be especially useful if there's someone asking "how would we use this in real life?" and the que...

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2. Feature Requests and General Site Feedback
3. Making learning content

It would be nice to have a mastery challenge for more skills than you have tried! Or perhaps give us the option to do a Mastery Challenge in the format you are suggesting.

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2. Feature Requests and General Site Feedback
3. Mastery Challenges