Your lines look good :).

As for ellipses, I can see they got a bit wobbly in the planes exercise. It's probably because you focused too much about fitting them in snugly. I'd suggest ghosting a bit more before putting down a mark. Once you start drawing, forget about ellipse fitting in perfectly and just focus on making a smooth mark. Your accuracy will improve with time as you continue to practice. Use ellipses in planes exercise as a warm up and the skill will come naturally.

Perspective exercises are hard to grasp. I get the dissatisfaction and desire to grind but you done well enough here. Your intuition and skill for perspective will be strengthened as you go trough 250 boxes challenge.

Good luck!