Lines

Pretty good job overall, I can see that even if some of your lines are off you still draw them confidently, that's the way to go! Keep practicing like that and you'll nail the accuracy.

For your superimposed lines, remember that it's important to practice curves as well, not just only straight lines.

Ellipses

For your ellipses, I can see you are doing a good job drawing them confidently as well, even though a few came out a bit wobbly. Keep trying to draw them as confidently as you can, always confidence > accuracy.

For your tables of ellipses, remember that the ellipses need to touch each others sides, as well as the top and bottom lines, just touch, not overlap. Don't draw ellipses floating. And same goes for your funnels, aim for them to touch each other, don't let a separation between them. Remember as well that the axis lines has to cut the ellipses in 2 identical halves. If the axis line isn't drawn correctly according to the curves on its sides, ignore the curves and allign the ellipses to the axis nevertheless.

Boxes

In your boxes I can see a few problems. The first one is that you are repeating lines. No matter how bad a line is, don't draw over it, keep going. Just like you did on the ghosted lines exercises. Treat every line as a ghosted line exercise.

Try to be more careful as well on the rough perspective, remember that the width lines should be horizontal, and that the height lines must be vertical, It's hard to keep them vertical and horizontal, but make sure you are being careful to keep them as close as you can.

In rotated boxes you are repeating lines again, never repeat lines. For the exercise itself, you've rotated most of your boxes, you're keeping the corners between boxes close, and you are drawing through your boxes, good job!

Lastly on the organic perspective exercise you aren't drawing through some boxes. Even if a box is on top of other, draw its lines. You can clarify their relationship after with a single superimposed line to add lineweight.

In those last 3 exercises it looks to me like you might have rushed them a bit. Remember to take your time with each exercise, and to ghost every line until you're confident. It's hard not to rush, so if you feel like you might be rushing, take a break and come later, don't force yourself!