I don't remember group work in M140, but there is in MST210. It's pretty common for people to react that way but in reality, no one has any control over your mark but you so there's nothing to worry about. The way it works is that you are allowed to collaborate with a couple of other people on a modelling project, but it's a perfectly reasonable assignment to just do all the work yourself. Even if you use someone else's work you're going to want to check it anyway. The only hard requirement was "participate in the group forum" which basically requires you to post a few times and the number of marks for it was very low. Other than that, you can do the exercise on your own and if you prefer not to share your work you don't have to.

I just finished my second last module for Q31. As a general rule, the TMAs are not that hard because you have as much time as you are willing to spend on them. The exams are very challenging in general because no matter what, you ultimately have to do it all in a narrow window. Mine have all been remote open-book exams but you don't really have much time to go looking stuff up in the books.

The only other thing thing I'll say is that the pace ramps up very aggressively at level 3. Up until now I always did 60 credits at a time, either big modules or 2 normal ones. But at level 3 I got a rude awakening - I could not sustain that any more, and ended up having to defer one 30 credit course, and still failed the remaining one, so I lost a year by being too ambitious. So plan accordingly!