I don't know at which point in your art carrier you are, if there is any time pressure to be most time efficient with learning some specific skills. But if not, don't pressure yourself to only do homework practices. It is ok to find your own way. As long as you don't have comissions to fulfill or something like that you can try different ways to improve your art, take time and find ways to have fun with it. For example I mostly draw what you see on my profile, meaning I don't do much pure exercises right now. But I watch a lot of artists (YT, courses, books...) and whenever I draw I try to apply something. Like I include a perspective layer, I try to push a pose, I tyr to get bolder with colors and so on. So in every piece I try to challenge myself with things I learned/heard before. It is not as efficient and focused as if you practice something very specific, but I have fun and can be creative. It is important to do the basics, defenitely. And even more if you want to go pro. But if you have time there is no harm to draw an actual character and while practicing a dynamique pose with it. I feel like I explained badly, ask if something is unclear ^^. For gesture drawing it is indeed effective to do douzens/hundreds of line of actions. But you can mix. Don't do that every day and wait to be perfect at it before you try your next heart project.

I agree with what Serena Marenco said. I also think you might be in that part of your improvement graph where your taste/ likes/ influences is higher than your current skill - which might be one of the causes to your stress/dissatisfaction ( which is a good thing, you know somethings up, you can tell there something can be done to make it better, your brain is identifying it). I just recommend to keep at it, keep on drawing and observing anatomy, review it for a few minutes, reflect on what could have been done better, put down that drawing and move on to the next one. It was one of the most difficult things for me to realize years later that not all your artworks need to be 'precious'. Build up on your smaller successes, not just the big complete illustration ones. Just put in some mileage, keep on drawing, but at a pace you're comfortable doing ( don't burn yourself out, breaks are there for a reason, we're not saying you can't draw anything else, when you're tired, draw something you like - it can be a nice change in pace now and then ).

There is no need to stress, the purpose of these exercises is not to produce works of art but to learn how to identify and draw the gesture quickly and automatically. There is a big misunderstanding, in general (thanks social media!) about what a sketch is: a sketch is a quick thing you need to fix an idea or study a solution in anticipation of a finished drawing or a simple exercise. Most of the sketches you produce are going to be throw-away stuff (I currently have something like 50 sketch pads to sift through looking for something that makes sense to keep before putting them in the paper recycling bin). So, the purpose of these exercises is simply to learn how to draw the gesture, without worrying about the rest. In later lessons you will learn the other basics, including balancing, but for now concentrate on the gesture until it becomes natural and you are able to draw it easily without thinking too much about it. I fully understand your hurry to move on to the anatomy course but if you don't learn the basics of figure drawing first, you won't have the basis to study anatomy (I'm telling you this from experience: I studied art, I have two degrees, I have exhibited in galleries, worked in publishing but I didn't understand why my human figures didn't convince me. The reason was that no one had ever bothered to teach me about lining, putting an anatomical manual in my hand straight away. Basically I was pretending to build skyscrapers without foundations. Of course they would collapse) So try to be patient, in the next lessons you will be given other equally important notions in order to then be able to tackle the anatomy course.