Hello! As a general note, try to follow the DaB format when it comes to exercises (e.g. if the page is split to 3, then do accordingly, etc). On to the critique.

Lines Your work here is good, as you are focusing on confidence first and foremost. Good job. There's some curving in your lines, so try to pay attention to your elbow and wrist as you draw, you may be using them unconsciously. However, don't redo lines, even if they're incorrect. This only serves to draw attention to it, which you don't want. Instead, move on.

Ellipses Solid work. You're ghosting and following through with the ghost for each ellipse, which is what's desired. Although inaccurate, that is ironed out with time. Though, in the funnels exercise, some of your ellipses are a little floaty, try to tighten them closer to the borders in the future. Also, try to make the draw throughs only be done 2 times, that is the ideal.

Boxes Again, good work here. In your rotated boxes, ensure that you only hatch in one direction, this is relevant in 250 boxes. Also, you can use line weight to clarify overlaps between boxes in the organic perspective exercise. Good work.

Overall, while I'm impressed by the quality of your work, I'm not quite ready to mark this as complete. I'll detail that below, but I just want you to bear in mind that in DaB, don't do-over any lines. Especially when construction becomes more complicated, it'll get very messy if you redo any lines.