Hey, Pencilshy. Your work is not atrocious as you believe it to be. There's definitely some areas you can improve and if you keep practicing correctly you will get better for sure.

The main problem with your superimposed lines is the arching, which makes me think you're not drawing with a motion from the shoulder. If you have trouble with this aspect, check this video Uncomfortable made about this issue. Your lines are fraying quite a bit at the end, but this is somewhat normal at this stage and with practice your accuracy will get better.

Another issue I notice is in your ghosted planes, where in some cases your lines miss both of the placed dots. Maybe ghosting with the pen closer to the paper might at least help you hitting that initial dot correctily. It also seems that in some cases you're not placing the dots for the inner lines, which is something you should do for all the lines you draw.

Your ellipses look good. Not major concerns here, except that some times you don't draw over the same ellipse. You should always draw through your ellipses.

On your funnels, you should have made outer arches more curved, so your ellipses woudln't end all in similar sizes as you made them to be.

Now, the boxes exercise is where you seem to be struggling the most.

The rough perspective is not bad, you managed to keep the horizontal lines aligned with the horizon and the vertical lines perpendicular to it. Again, your lines are slightly arching here, which is something you should pay attention to.

The rotated boxes was definitely a challenge to you, as it is a very hard exercise. I advice to reread the exercise page, specially the section about rotation as this will help you in the boxes challenge in the future. The thing I'm most concerned here is the fact that you go over the same line many time, which ends in a very messy drawing, as I suspect you will agree. Avoid doing this. There's no point in doing it, as it won't make anything better and will probably hide your mistakes, preventing you from identifying them correctly.

Now, on your organic perspective exercise, you did a good job in drawing the flow of the smaller boxes (farther away) to the larger ones (closer). You could have placed some more overlapping boxes and played with the line weight in order to highlight which is in front and which is in the back. The perspective could also be better and I think this happened because you might have rushed a bit and didn't took your time to prepare thinking about each box before drawing them. Your line work suffers from the same aspects as before. Another thing I'd like to mention is that when drawing the flowing line there's no need for it to be super thick in the closer end. I'd rather seem a smooth line with less thickness difference than to see the scratchy lines as you made.

Please don't be discouraged by this. You went through all the exercises in this lesson, which is a good thing. There are areas you have to improve, but I am positive that if you apply yourself, you'll definitely get better.