Hi, it's cool that you decided to take drawing seriously :). Overall, your work looks good.

The superimposed lines, ghosted lines and ghosted planes all look good. The only thing I would say is to watch out for wobbly lines. As you will probably here many times on Drawabox, prioritize confidence over accuracy. Which means don't worry about your line being completely off as long as it was done confidently avoiding any wobbling. Also in the ghosted planes exercise, it seems that you didn't put start and end points for the cross section lines. While it may have seemed like there was a need for doing it, it's always good to mark were you want the line to start and end.

For the table of ellipses, ellipses in planes and funnels, again they're a bit wobbly. Make sure to try to draw them with a smooth, consistent stroke even if each pass doesn't overlap exactly with the previous one.

Lastly, for the rough perspective and organic perspective, make sure not to repeat lines. I know resisting the urge to correct an especially off line can be hard but the point is not be make a perfect drawing. Putting start and end points and taking the time to use the ghosting method will increase your chances of making a good line but even after doing these steps it can still turn out wrong, and that's ok.

Also don't worry to much about the rotated boxes, it's a difficult exercise. Most people mess it up and that's sorta the point.