Hi! It's overall a very nice work, so I will try to focus on the details that could be improved.

Lines

1. Superimposed Lines: The lines seem to be done with confidence and there is almost no fraying on the starting side. There is a bit of wobbling on the ending of the more complex figures, but nothing serious.

2. Ghosted Lines: Pretty good, but there is a bit of wobbling, specially on the smaller lines. You may be accidentally drawing these with your wrist because of their size, so try to focus on using the shoulder even if the line is small.

3. Very nice! All your lines are confident and smooth, te wobbling from the previous exercise is essentially absent.

Ellipses

1. Tables of Ellipses: They're mostly tight and well-round. You are also drawing through them, at most 3 times.

2. Ellipses in Planes: Everything seems to be ok. With practice, they will get tighter.

3. Funnels: The ellipses are touching each other and the walls. In some funnels, the minor axes is tending to one of the sides. Possibly this is happening because the guiding curves are misaligned.

Boxes

1. Plotted Perspective: Not much to comment, everything is between the VPs. Nice colors by the way ;)

2. Rough Perspective: Everything is in one point perspective and the frontal planes are all straight. In a few boxes, the back plane is not perpendicular to the horizon line. Possibly, when it came the time to draw the last edge between the front and back planes, you choose to plot it back to the VP. This gets the perspective right but makes the form rather "unboxy".

3. Rotated Boxes: Yeah, this one is really hard. The left side seems to have been better executed than the right one. The rotation is visible between the center box and the ones adjacent to it but it is only slight on the outer boxes, thus it seems as if they are only translated. On the top-right and bottom-right corners, it seems that you've hatched the boxes top face, so things get really confusing. Last, in many cases, the side of adjacent boxes are not parallel (or almost parallel) nor of the same size. This results in the boxes not fitting nicely in the scene. I suggest using the already drawn boxes as guides when drawing new boxes, this makes your life much easier.

4. Organic Perspective: Well, this one is actually pretty good. The boxes are smoothly drawn and look rotated. There are some inconsistencies on the boxes' sizes however. Sometimes they get bigger and than back to smaller and bigger again... The idea in here is to get the boxes progressively bigger as they approach the line's end. Also, there is not much variation in their sizes. You could have made things a little more drastic to play with the sense of depth. The only real problem in this exercise is that you are drawing outside the frames. The frames are like "windows" to your drawing's world so not respecting them kinda breaks the scene's consistency.

Well, that was all I could grap. Hope that was hepful! :)

PS: Your line's smoothness really improves throughout the lessons. It is much better in the organic perspective!