You show serious improvement between the first and second page of the Tables Of Ellipses exercise.

Some of your Rough Perspective boxes have points that are placed slightly off, but your understanding of where they should be placed is good.

Your Rotated Boxes are well-done, but you add lots of unnecessary line weight on the Organic Perspective boxes, and some of them also have lines which converge incorrectly.

I would say that you're ready for the Box Challenge.