I've realized that I really don't have good study skills or writing strategies. Now I'm actually trying to do something about it. I've collected a bunch of information about things I could do, and I'm going to try and implement them.
I don't know if I have ADHD, but a lot of the tips sound really good and helpful. And they're bite-sized, too.
Thanks everyone. I'll update this thread around Tuesday, by when everything hopefully will have been sorted out.