1) Communicate your thought in as few words as possible. Make a game of it.
2) do not document the thoughts necessary to come to your conclusion.
3) use lists where practical, not paragraphs.
School teaches you to write in a certain style, vs how to focus and develop the content or thought.
Writing for someone who knows more than we do is very different than someone who knows less that we we do.
The puff, the explanation, the stretching of concepts are all designed to impress a teacher or professor. In writing for someone who knows less, all those writing skills get in the way of a newbie understanding the concept.