Once you've had your box challenge marked as complete (via official critique if that's what you're aiming for), we do not require students to do it again - that is left up to them.

That said, even in the case that a student wants to start over from a clean slate, even then we don't really want students to redo the box challenge in its entirety - rather, those who'd already completed it even without receiving official critique are generally asked to submit what they already did plus 50 additional boxes after receiving their L1 official critique.

So, needless to say, we're not big on students redoing the box challenge either (outside of keeping up with the exercise itself in their warmups). I would however recommend that you do at least go over the lesson material to refresh your memory on how the exercise works - it was actually updated and modified a couple months ago, so you'll want to be up to date on those changes.