Your line quality is great, in most exercises your lines are smooth, hit both points and end nearly perfect, all that i can criticize is that you tend to arch them slightly upwards, this can be addressed consciously making a downwards arch to straight them.

To me, your ellipses looks great, they are pretty symmetrical and smooth, the second ellipse is almost the same as the first, some look a little odd but that will be addressed with practice and more confidence, good job.

Now, on the boxes, I can see that in the rough perspective your lines become much more shaky, almost like if you stopped using the ghosting method, remember to ghost your lines until you feel confident, and then and only then make them, also be sure to make them with your shoulder.

The rotated boxes are a bit odd, the ones in the Y and X axis looks pretty good, but the ones in the corners should look much more compacted and almost triangular like, remember to pay close attention to both the video and explanation for each exercise.

The organic boxes otherwise look pretty good, your line quality got better again but not as good as in the first exercises, also some of your boxes are not rotated at all, you can see this in the last page, the first 5 boxes are, in my opinion a little too similar between them, try to rotate your page to see more points of view.

In general it all looks pretty good to me, just remember to take your time with each line you make, always use the ghosting method and draw with your shoulder.

I would add : keep practicing your ellipses with warm up exercises, to improve the fluidity of your movements while drawing from the shoulder. Right now the curves tend to suddenly change direction in several places, instead of progressively bending and turning. Don't worry though, it'll come with practice.