This is from Drawabox Lesson 0, Part 4: Getting the Most out of Drawabox on Youtube.

"Next, we come to this list of the homework assignments from the lesson. We can check off what we’ve completed - ideally we’d be checking everything off. If not, the submission will be considered partial, and while you can submit it that way, it’s unlikely it’ll be seen by others, and it will just go to your personal sketchbook."

So yeah, I guess you do have to re-do those pages so you would have a better chance of getting your work reviewed.