I vote that you keep going!

You can always practice ghosting lines as a warm up if you like. You will do all of the lesson 1 exercises as warm ups in the future anyway, so you will get plenty of practice and opportunity to improve.

The critique is there to let you know if you need to go back and redo anything before moving forward. They know better than we do if we are ready to move on, so let's let them worry about it.

While Gogoieo gave you the correct answer that you should continue pushing forwards, I did want to point out that Lesson 0 states that you should not be making the decision to redo work outside of what was assigned yourself. That falls to the person giving you feedback, as that will ensure you're not deciding to redo things on an arbitrary basis (which would constitute grinding, as when you're tackling these exercises for the first time you're not in a position to really know what kinds of issues are normal and expected, and what suggests a misunderstanding of the material).

Hello,

Here are my advices. You first say that "when you're doing the rotated boxes exercices, it feels like forever". I also have this troublesome relationship with time while I'm drawing. What about using a timer? Your smartphone should have an alarm function. Pick up between 45 minutes and 1 hour and see how it goes. Once the alarm rings, stop and make a 10 minutes breaks. If you are really tired, you may go down to only 30 minutes, if you're not that means that the timing feats you. You can do this several time during a single day.

Despite of what people think learning to draw can be tiresome especially for beginners because it requieres concentration. Tireness may be responsible for your other problems (such as woobling lines). Warm-up is the content itself of the lesson so you can really say you're not doing them so don't worry too much :)

It's just that you're a beginner, so you need time to register how to execute the exercices correctly.

I advice you to go by Ceaser's motto "divide and conquer". First the ghosting method. Post some 3 or 4 pages with lines and dots on the discord and ask for feedback. You need to identify first what are the problems because Draw A Box courses focuses on correct mark making, so you need to show that you learned how to do it to get your badges..

Then you can do the same for the following exercices of lesson 1.

Finally about the rotated boxes exercices. It is the final exercice of lesson 1 and it is quite challenging. I advise you to re-watch the video of unconfortable and to post incomplete versions of the exercice on the discord. First you should only draw the horizontal lines of boxes to put it on the discord and make sure from feedback that you're not making mistake at this stage. Then, some days after, another page with this time the horizontal line and the vertical line of boxes in perspective. These two lines are used as reference to place the others boxes on the page, so they must be correctly put on the paper sheet.

I hope that all these pieces of advice will be useful. Good luck!