Hi nnenaahukannahjnr,

We're sorry to hear that the experience with the "Start Over" feature has been frustrating lately. I’ve shared that comment with our team for future consideration.

Regarding your comment about the videos, especially in the 7th-grade angles unit, that’s something we would want to look into further. Could you please submit a support request in our Help Center? Here's the link: http://khan.co/KA-support. Tell us a bit more about which specific video or exercise didn’t feel like a good match.

We’d love to know the title or a link so we can investigate.

Thank you for being a part of Khan Academy!