Hello! Here is my critique for your work. Unless I wasn't looking correct, it seems like Rotated Boxes weren't there? Unless you forgot to add it in. (Until then I'll go through the rest of the work regardless)

Lines

Superimposed Lines

No problems with it, most of your lines only fray towards and the end and not the start (which is the intended goal).

Ghosted Lines/Planes

I found that most of your lines were arching in the opposite direction (hence not being straight). Remember to ghost your lines as many times as you need to confidently execute a stroke, because confidence > accuracy. Also, keep in mind that you can turn your page before drawing your line to get a comfortable angle before drawing it.

Also, to prevent arching lines, you can always try to draw with your shoulder pivot, but if that still persists, you can try to arch consciously to the opposite direction.

Ellipses

Most of your ellipses did not appear equal (being that if you folded it into half, both sides would match). Besides that, try to have your "drawing through" of an ellipse close in a bit more better. You can look at the 2nd and 3rd section of this photo to see what I mean.

Again, similar to lines, remember that you can ghost as many times as you need to develop a confident ellipse.

Ellipses in Planes/Tables

(Planes)

Try to have your ellipses touch all four corners of a plane.

(Tables)

Try to keep each ellipse within the bounds of a box it's in, while not overlapping with another. I've also noticed some of your ellipses were not touching the top/bottom of the table snugly, but just "floating" instead, which isn't necessary. Again, you can plan and ghost your ellipses before executing them. Try to make use of the space as much as possible.

(Funnels)

As mentioned again, your ellipses drawn should be equal, to let the minor axis should (line in the middle) should be cut the ellipses in 2 symetrical halves. Try to have them fit snugly within the funnel, kept within its bounds, as some ellipses were flowing out of it, or only touched one of the sides.

Boxes

Plotted Perspective

No problems with it, though you can do you hatching with a ruler. Not too big of a problem, though.

Rough Perspective

It seems like you made the mistake of plotting your drawn lines back to your Vanishing Point, as shown in the exercise's page. You're supposed to draw your depth lines to intersect to the horizon line, not directly to the Vanishing Point, as shown here.

Remember that you're supposed to draw your boxes in 1 Point Perspective. Hence, each box has 4 points to converge with the Vanishing Point. Here's an example where there were 3 points instead of four. It also seemed that you were drawing 3 Point Perspective boxes here, instead of 1.

Rotated Boxes

Missing?

Organic Perspective

Most of your boxes were either parallel or diverging from one another instead of converging, which the latter is expected for 3 Point Perspective. Though, that's a perfectly fine error for now, you'll tackle it again in the 250 Box Challenge. Also, each angle of the initial Y should be over 90 degrees. Here's a demo of a 3D interactive box with vanishing points, with a pic of showing what converging/diverging/parallel means.