Arrows look good, but they got a few issues: They have a slight wobble, specially at the overlaps (remember that even when adding lineweight to them you should do it with a confident stroke with your shoulder, ghosting it).

Try not to rush hatching as well, and to improve their feeling of 3d, you could make them grow more exponentially.

Sausages look pretty good, some of them have a very slight pinch or are a bit pointy, but I think you're aware of it. Just in case, remember that sausages should be formed by 2 identical balls connected by a tube of consistent width. Main problem I can see is that your ellipses aren't shifting much, try to be more aware of how the contour behave in 3d space. I recommend going through the mistakes section of the exercise, and feel free to ask me again if you still got doubts.

Texture analysis looks good, though I can see some scratchy lines. When drawing the cast shadows, fill them with areas of black, being careful not to leave any white dots and that the shadows you drew are smooth. Good job too in the gradations, though the transition from black is a bit too sudden, try to make it smoother.

InDissections I think you are focusing too much on drawing the contours of the forms. Remember that we should only be drawing cast shadows, nothing else. So you shouldn't outline every form you can see. Here as well, try not to leave white dots between the shadows.

Form intersections Careful with the foreshortening. This exercise's main objective is to draw forms in a way that makes the viewer think they exist in the same space. To do that, every form should have consistent foreshortening with the other forms. To accomplish that easier, you can make most of your forms to have shallow foreshortening. Your lines also overshoot quite a bit, and others have fraying quite a bit, which suggest me you might be rushing the exercise. It's a hard exercise, but don't rush it, if you are starting to rush, take a break and come back later.

Organic intersections look mostly believable, but they have a few issues. The first one is that you are using complex forms. Try to stick only to simple ones, no really long sausages with curves and no squished sausages. And the other one is that you haven't used shadows at all.